Just stocking up a little more at a time on most things we use often, that can still be put aside until needed. Canned fruit and veges can often be kept well beyond the Best By dates. as can cereals and grains until the cans/packages are opened. Meats and fresh items might not be kept for longer times, even frozen, so just don’t overbuy but keep what you need on hand if it’s possible.
Dry goods, cleaning supplies, etc., medicines and supplements may also run out over time, so be aware that you may be buying for well past only December.
Tired of talking so much doom and gloom by me, but it seems this c-19 might well be around for some time to come., sorry to say.