Are garbage cans food safe, or made of food grade plastic?
What you want is something that is listed as NSF rated for food storage. I know both Huskie and Rubbermaid Brute containers (10 gal, 20 gal, 32 gal, 55 gal) that are gray, yellow or white have that rating. If you have a restaurant supply store in your area, you could go look around for "ingredient bins" and commercial garbage cans. Just remember, a white Brute bin with lid that slides open and is sold as an "Ingredient Bin" will probably run $85 while the same white Brute bin with a flat lid and sold as a "Garbage Can" will run you closer to $45.