Is there a store where you can buy empty gallon cartridges at?
I need 2 empty plastic gallon cartridges such as milk or juice cartridges.
Containers? Drink two gallons of something good...it's a win win!
How about spending about $2.00 and getting you 2 gallons jugs of water? Water some plants or throw it away, and you have 2 gallon jugs. Is that what you mean by "cartridges"??
Just buy the cheapest fruit drinks, like an imported one from Guatemala and either drink or dump it. Most Supermarkets have a section that is strictly foreign.