Whenever I sailed as crew, and later when I actively raced my own boat, the practice was:
On beer-can and single day races the skippper provided the beer, soda and snacks (never-the-less, most of the crew seemed to bring along a 6-pack of their own and at the end of the season we had to unload a sizable amount of "moveable ballast" in the form of unused 6-packs). Following the races the skipper usually paid for dinner, although in those daze that was usually $1 a piece hot-dogs or hamburgers; and,
One long distance races, the skipper usually provided sodas, water and snacks and at least one good meal a day, usually dinner, plus dinner and drinks for all the night before the start (to moderate that number of pre-race drinks) and dinner and drinks once the race was done. Each crew normally contributed their proportionate share of meals for the race itself, or their proportionate share of the costs of provisioning, plus, again, the amount of beer or wine each person thought they might consume--plus enough for one other crew--keeping in mind that ours were "dry" boats--i.e., for safety sake, when off soundings, we limited ourselves to one beer or glass of wine with snacks before dinner (sun downers) and a second, only, with dinner itself.
The big deal wasn't beer or wine, or even food, but "treats". Cookies and snack-cakes/pies and like and one-bite candies (Snicker's mini's etc.). Four daze into a race and short on "treats" some guys would trade a watch for a couple of Snickers mini's (if the watch commander would permit it). We always carried a hidden stash of Snickers, Hershey's Kisses, and the like and usually a chocolate cake and a bottle of bubbly for the night before a finish. Even if we didn't win, show or place, we were pleased with the effort.
FWIW...