==The beginning of summer==
Just buy hamster ball you think is good enough for you and buy a metal container that hopefully fit in there.
Now, the only required materials other than the hamster ball and metal container are:
(note: when buying the hamster ball, be sure it has screws in it)
-Hot glue (so you can fill in the holes which were meants for oxygen) ($1)
-rock salt, ice, and ingredients for ice-cream ($2)
-the unversal binder of all things, Duck tape ($2)
-Patience and have fun!! (priceless)
-The makers of the "freeze and play" ice cream maker
(note: likely its too hard to play light soccer with)
-Clothes dryer ice cream, who figured.
Step 1: Buy hamster ball and obtain metal container
There are 4 sizes of hamster balls. here is an estimate of how big they are and how much they cost
(note: when you buy it, be sure it has screws in it!!)
-very Small-imagine fitting baby mic in this (about 4 dollars)
-Small-imagine putting a little bird in this (aobut 7 dollars)
-Medium-imagine putting your baby turtle in this (about 17 dollars)
-Large-imagine putting a full grown hamster in this (about 22 dollars)
== Metal Containers ==
Though people usually use metal coffee cans for this purpose, look for small metal tins or candy at the asian store where they usually have lots of metal containers with plastic caps. (evaporated milk is a good source, but try not to waste too much food)
Now, you want to be sure you metal can fits through the entrance of the container easily and has some space to move around.
The main purpose of this whole project is to make the hamster ball water-proof. Which means filling in all the nooks-and-crannies so that no water brine spills out.