Hi Dave -
Are you going to be staying in marinas, anchoring out, some combination of both? I typically only go for about a week at a time at most and usually can get to a marina if I need to. Some of the trips are mainly harbor hopping, others are anchoring out. The things I would not do without are my Origo alcohol stove (I have the single burner version and it works fine) and my Magma gas grill. The grill is great for burgers, steaks, chops, etc. and everything else can be done on the stove. For a week on the water, I take coffee, cheese, nuts/fruit (apples mainly, but no banana's, since I hear they are bad luck; I'm not superstitious but why take chances for a banana), granola, tortilla wraps, some heavy wheat bread, couscous, cups of ramen noodle soups, yogurt, and for meat, thin sliced pork chops, bratwurst/italian sausage, and polish sausage. I always have plenty of water, soda and of course a few adult beverages for happy hour at anchor. I've got a couple of coolers, one small one mainly for the meat which doesn't get opened much, and one (built into the cockpit) for drinks and other things that need to stay cool. The boat actually has a small dorm fridge but that is only used when hooked up to shore power. I have room for 8 gallons of water in my internal tank and I typically take a 5 gal. portable tank as well.
Also think about power if you are anchoring out. My diesel powers my two house batteries, (and shore power also charges them) but I also have two extra's that are charged and secured in the cabin should I need them. If all my batteries die, I would have a hard time starting the diesel. I'm also going to get a small solar panel. I had one for my 222 and it kept the battery topped off in most cases.
Finally, think about safety equipment if you're going to out for a while. I have three anchors (2 danforth and one delta) with 6 feet of chain and 100 ft. of line (I may get more, seems like cheap insurance), life jackets for 6 people, jacklines, harnesses, two GPS units, depth finder, autopilot (Raymarine ST1000+), spotlight, flares, main vhs, portable vhs, cellphone, radar deflector, emergency antenna, lifesling2 and I even bought one of those spot locator devices so I could be tracked online (the latter was purchased so my wife and I could keep tabs on our 22 year old daughter who took a 500 mile bicycle trip, but I'll use it for cruising as well). I always have detailed charts for the areas I'm cruising, plugs in case I get holed, and a portable kayak and pump. I have a little walker bay dinghy but don't usually take that. The kayak works fine, and if I'm cruising with someone else, I have a second one. I make a list of phone numbers I might need to use, and I check in with my wife somewhat regularly. I'm sure I'm forgetting some things that I've acquired over the years, but that's most the list. Oh, I also have one of those solar showers like Joe has, and I keep a shorty wetsuit on board in case I'm cruising early in the season when Lake Michigan is still cold. For firstaid kit, bandages, painkillers, anticeptic spray, benadryl, motion sickness pills.
Oh yeah, tarps/bungies and bug screens.
That's it from the top of my head.
Hope this helps,
Dave
s/v Lagniappe
O'Day 25