I have done a few of these to Mead. Usually big trips. 40-50 people 4+ Houseboats.
The way we did it was divide the couple up in teams. We were responsible for cooking & cleaning one dinner & breakfast for everyone. Then we were done for the rest of the trip.
Make something for dinner you can prepare early & freeze. Spagetti sauce, ribs, etc. Lunches you were on your own.
Everyone pitched in & all the food came out of the one budget.
It helps to have someone really organized put the trip together. The girl that did it for us always got her trip for free. It was worth it.
Also the best thing we ever did was bring a commercial ice macine with us. A bilge pump in the water for a supply line & all the ice chest stayed stocked.
The most important was bringing the right group of people. It takes alot to get along for a week, when you can't get away.
Beer is always good also, lots of beer.
Excellent tips...
We did the same for three weeklong trips to Shasta. Unfortunately the one 4 day trip we did we had a bunch of relatives of one of the partakers that decided they were ON VACATION and we were there to serve them. So that trip didn't work out so well. Thank god it wasn't a full week.