Depends on the rink.
here is the best way to go about getting all the snow you need.
If you have a truck, walk into the rink, and offer the rink rats some booze, and ask if they would either a) dump the snow directly into your truck, or b) never melt snow and drop it all behind the rink. (a lot of places melt all their snow indoors now for whatever reason)
Scout a few places, sometimes snow just starts to build up in places in which case... its snow, just take it. Dont bother asking if you dont have to, questions just equal problems.
If you dont have a truck (I Dont, I have a wrx 5 door.) buy some large rubberwear containers, and just fill them with snow, and in turn fill your car with them. That is what I do, and it is perfect. Its a little easier to set up in places sometimes if you cant get the truck up or down.