For the person organizing it
If you run the calendar for an HOA, a school, a PTO or a swim team, you have a harder job than a birthday party — more people, a budget somebody signs off, and a hundred kids who all want the same thing at the same moment.
This page is the practical stuff: how many drinks one machine actually makes, what we need from you on the day, and what we cannot do. All the numbers are on the page rather than behind a phone call.
Check a datePool opening, summer socials, movie nights, Fourth of July. One machine covers a mid-size social comfortably. A big pool opening is where it starts to work hard.
Field day, end of year, teacher appreciation week. Daytime, all ages, no alcohol anywhere near it.
End-of-season parties and meet days. Hot, long, and everybody is thirsty at once — which is the case one machine handles worst, so read the sizing below.
The kind organized by four people in a group chat. Usually one machine, usually mixed ages, which is what the two tanks are for.
The honest numbers, so you can size it before you call anyone. A twelve-ounce cup, a three-gallon tank, and what stays stuck to the sides already taken off.
The thing that trips people up is not the crowd size, it is the shape of the event. Ninety people spread over three hours is fine. Ninety people who all line up the minute the whistle goes will empty both tanks in about fifteen minutes and then wait twenty for a refill.
If your event has a moment like that — the end of a game, the start of a party, an awards bit — tell us when you book and we will size it for the rush instead of the total.
You can run your own numbers on the cups calculator in the Lab — it shows the arithmetic rather than just an answer.
At a birthday party everyone wants the same thing. At a neighborhood social you have eight-year-olds and their grandparents in the same line.
The machine holds two flavors at once, and one of them is always a drink with nothing in it that a kid should not have. That is rule one, it is free, and it means nobody at your event is standing there holding the wrong cup.
Shade is the one people forget. A machine in full Texas sun works harder, and the drink comes out softer.
You do not rinse anything, scrub anything or store anything overnight. We deliver it, set it up, mix the first batch and show whoever is running the table how it works. Then we come back the next morning and take it away dirty.
Cleaning it properly takes about an hour and it is our job, not yours. That is rule six.
We cannot sell drinks at a public market or festival. Dispensing drinks to the public for money is a prepared-food operation and needs a temporary food permit we do not currently hold. At a private event — your pool, your school, your street — that does not apply, and this is the ordinary case.
If you are running a public market and want us there, say so up front and we will find out properly what it takes rather than guess.
Anything with alcohol in it is a grown-up’s job, start to finish. We make the frozen mix, which has no alcohol in it. If your event has an adult drink, an adult on your side pours their own into the tank, from their own bottle. Harper is 11 and Finley is 8 and they are not anywhere near that part.
For school and daytime events this never comes up at all, which is most of what this page is about. The full version is on our promise page, written before anybody asked.
If you need paperwork, ask before you book. Some HOAs and schools need a certificate of insurance or a vendor form on file. Slush Sisters LLC is a registered Texas business with liability insurance — but what exactly we can put in your hands, and how fast, depends on what you need. Email hello@slushsisters.com early and our dad will take care of it, rather than us promising something on a website and finding out later.
Most rentals arrive as a man with a van. Ours arrives as two sisters who own the company, and they set it up themselves and explain it to whoever is running your table.
For a community event that is worth something real: it is a story your residents talk about, and it is a photo and a paragraph for your newsletter that you did not have to write. Several people will ask the girls how they got started. They like being asked.
If your newsletter or calendar wants the story rather than just the booking, say so and we will help — that part is free.
The same as everything else: $250, everything included, whatever the guest count. Extra flavor batches are $25 each. We do not charge per head and we do not raise it on a hot weekend — that is rule three.
Not yet — we own one. For a big event we bring extra batches of mix and refill it during the party, and a refill takes about 20 minutes to freeze.
So if you are over about 90 people, or everyone arrives at once, tell us the numbers and we will say honestly whether one machine is enough. Sometimes the answer is no. We would rather say that than take your money and have a queue of people waiting at your event.
Yes. The same machine will chill a drink instead of freezing it, so it works at a December event as well as a July one. Most people do not know these machines do that. How that works.
A $50 deposit holds your date, same as any other booking. The rest is due at the party.
Tell us as early as you can. We would much rather move a date than have a machine sitting in the rain at an event nobody came to.
Yes, and they are good at it. They can explain how it works, what is in it, and why sugar is what stops it freezing. If you want a proper five-minute version for a classroom or a club, ask — they have the whole thing written down.
Headcount, the date, and whether there is a moment when everyone arrives at once. That is enough for us to size it.
Check a date