Place
whey in clean glass jars and store in the refrigerator.If you are using raw or cultured milk, place 2 quarts of the milk in a glass container and leave at room temperature for 2 - 4 days until the milk separates into curds and whey.
Store
in clean glass jars in the refrigerator.Source: Nourishing Traditions by Sally Fallon with Mary G. Enig, PhD.
Slice thin wedges and place
them in a clean glass jar with a tightly fitting lid.
I store
mine in clean glass jars leftover from pasta sauce, salsa, etc and then store it in the freezer.
In a clean glass jar, your water / oil solution will generally stay fresh for a week or more - but usually for dogs, they drink enough water that you'll run out of Dog Breath Water before you would have to worry about it becoming «stale».