Hi, I kept mine in a glass jar with lid on. It can keep for a few months in the fridge if not contaminated. The quantity you make depends on what you are using it for, so really no rules apply :-) Cheers!
Heavy cream is just thickened cream that you can buy in the supermarket. I bought mine :-) Let me know if there's anything else I can help you with. Thanks for watching. CHeers!