You know, you should try one of those wristbands for motion sickness - maybe that'll help. Of course, when you get away from the wind, you won't need it so badly - but losing all this weight and constantly being nauseaus can't be good!
You have the ideas on foods. I buy canned and packaged foods that I'll use (carefully, reading labels) and basically ones I bought before when I was in a house - although I'm pickier now. I keep canned fruits. I actually buy the individual servings. I get things for recipes I might be making - then when I make them, I keep out a couple meals, and freeze in pint size bags 1-2 portion servings. When I was buying monthly - the first week to 10 days or so, I'd eat fresh fruits and vegies. Potatos, of course, can last the whole month. But salads, etc - first week to 10 days, as well as fresh vegies and fruits. Then the canned and frozen the rest of the time. I have oatmeal in the cabinet. I always have a dozen or more Quaker breakfast bars in the light versions - those are either a snack or sometimes breakfast, especially when I'm on the road. I buy cheese and crackers/peanut butter and crackers and keep that in the cabinet for when on the road, also. A quick lunch for me can be my own different versions of nachos, so a large bag of tortilla chips is usually in the cabinet. Yes, I use powdered milk - but I dont' drink milk, just use it in recipes. I usually have 2-3 (sometimes more) of those healthy choice meals that don't need refrigeration (have none right now, but got those when I was not shopping often). I usually have a couple cans of tuna and a couple cans of cooked chicken on hand. A box of rice. Cereal. Oh, I don't keep anything in the original boxes - they take up so much space. I remove the cereal bag, etc and keep it separate. I love cheese - and keep Wheat Thins lite in the cabinet - and almost always have a few kinds of cheese in the fridge as well as the light shredded Mexican cheese (when I made potato soup last week, I made it potato/hot pepper cheese soup, for example). I look carefully at dates when I buy yogurt - sometimes it has a good 3-4 week shelf life, which is good for me, because I only want it occasionally - then I can buy 6 to 8 of them and know they'll all get eaten. Hopefully you're getting the idea. What you'll have in your cabinet will be different from mine. Oh, I try to always have some tomato paste and sauce and a couple types of pasta. Obviously it's not hard to fill my cabinet. But it doesn't mean I always am eating a meal that makes sense. I'll combine strange things
But tonight - I made instant mashed potatos, pulled out a pre-cooked pork chop from the freezer and heated it up, and made an individual serving of green beans. (Pre-cooked pork chop because when I cooked them last time, I cooked the 3 in the package, ate only one, froze the other 2 - makes for a quick dinner and I only have to dirty my George Foreman once for 3 meals). When boondocking at lot - or no sewer a lot - those things can be important.
Way off the subject of packing cabinets, eh? Oh, and every few months I try to empty out my two food cabinets and reorganize with the older things in front - forcing myself to use those. Things can get hidden/buried.