Sure sounds like communism to me. They want everyone donating to these communal supplies, which will be controlled by the hounders. And, distribution will be based on how much you do for that joke-hova. If you are not "in good standing", or even "exemplary standing", you might get lower priority or even nothing, even if you donated huge amounts to the stash. And even if they are using your space for it.
You are better off, instead, to make your own pantry if you can. Rice and beans are a good starting point, but you are probably going to need to vary it up some. Canned meat is a good idea--canned tuna, chicken, and salmon is a good buy (and I am aware that some salmon does cost an arm, a leg, and a mint but there is salmon that is reasonably priced). Canned vegetables are better than nothing, and I prefer the unsalted versions because vegetables are not supposed to be salty. Cereal grains are also nice to have--some are quite expensive, but oatmeal is reasonably priced.
And give them nothing. You can give them all you want, but make one little mistake in your service to joke-hova, and you are going to get nothing out of it. You can and should get items you enjoy or will enjoy, not what everyone else wants. You get a decent stash of food, you will need to take nothing as well. And yes, items like coffee are nice to stock up on if you drink coffee. I do not recommend cancer sticks, however, because they waste money and space to ruin your health. (In fact, now might be a good time to quit if you do smoke.)
In addition to food, now is also a good time to pick up plenty of batteries. Rechargeable batteries and a good battery charger are nice for rolling blackouts, and should be part of your store. Primary batteries are better during those blackouts that could last months--you can't recharge your batteries if your electricity stays off but you can recharge them between rolling blackouts. Make sure you have enough flashlights and battery powered lights and lanterns. A good headlamp is a good help, too. And candles, used carefully, can provide a good source of emergency light and heat.
Also, good entertainment. You might be able to rely on power banks for rolling blackouts, but not the ones that last for months at a time. A power bank will allow you to play video games on your Nintendo 3DS or your phone a while longer. Board games, cards, books, and art on your walls are good for longer blackouts since they require no batteries. You might also start a garden, not only for food but because it does provide at least some entertainment. Again, do not let the hounders see it because they will object to it.
And coins. It might be too late for some to stash silver now (if you can still stash silver without hampering other preps, you had better get going now before it gets too expensive or in short supply). You can still, however, get individual coins that are better than nothing. This can provide some entertainment, too. Lincoln wheat cents in average circulated condition are a decent value--you can pick up a few rolls of mixed '10s, '20s, or '30s online, or rolls or bags of mixed all dates (you probably will get mostly pennies from the 1940s through 1958). Jefferson nickels before 1964 are also reasonably priced--though you will probably not get any "war nickels" (which are part silver). Dimes, quarters, and half dollars before 1965 are 90% silver--and are still reasonably priced (especially in average circulated grades). The half dollars between 1965 and 1970 are "silver clad", and those from 1971 on are cupro-clad (except some proof 1976-S, which do come in silver clad, and some proofs from 1992 on available as full silver). Silver dollars after 1970 are clad, again except silver clad proofs are available from 1971-1977.
Whatever you do, do not share with the congregation. These items are meant for family or friend entertainment--if you choose to have visitors, you might use these items for their entertainment as well as yours. But, if you give them to the congregation, you might as well not even waste the money on them.