Quick, SImple, Cheap - Homemade Ice Packs

1 cup rubbing alcohol
2 cups water
zip lock bags
blue food coloring (optional)

Mix, freeze.  

That's it!  SO simple, and these are awesome.  Do some in gallon bags for more flexibility around knees, etc - use the same amounts given here.  When frozen, these feel exactly like the expensive ice pack I paid a lot for, for Matt's knee.  

Next I want to sew some covers for these..  we can wrap them in dish towels for now, but covers are nice.