Suev14. Well, the biggest boost comes from giving the baby colostrum (which is the first few days). I don't see any reason you couldn't do that from one side (incidentally, lots of women happily feed long term from one breast. Not all women find it possible, but plenty do, if that's anything you want to look into).
Is there a reason if you do do one feed you'd want it to be expressed? Is that a worry about the baby taking to bfing if mostly ff? I just ask because, obviously, it's more unnecessary work if the baby would happily feed direct. You may have other reasons for preferring that though.
NHS linky on storage. Depends if frozen or fridge.
La Leche League linky on alcohol. Basically, you don't need to worry if you're drinking at reasonable levels. Of course, no one should be drunk in charge of a baby, and it ain't any fun being up in the night with a hangover, so you'll probably be drinking fairly moderately for a while anyway.
You might find that one feed a day does bring supply issues though. It may not be enough to maintain production past the initial, hormone driven, stages. You might want to start a thread on that if some bm is important to you.