Here's a link to 'Mountain House' foods. I understand that they're very good and can be purchased in almost any large sporting good store or order from Amazon.

Just get a few entries, breakfasts, desserts, side dishes and take them on your trip. He'll always have a supply of vegetarian meals available that can be made in short order to supplement the stuff he's able to eat. If the pouches aren't used, put them on the boat. They're good for at least 5 years. Hell, even the other guys might grab some for fun.

An easy solution to a camping dilemma. A no brainer that will satisfy. Dale mentioned Backpackers Pantry as possibly better. I looked on the page and those products are after Mountain House.

The link http://www.nitro-pak.com/food-storage/specialty-food/vegeterian#!/p=clear&size=72&order=position