Can he eat almonds and cashews?

Remember that this is a tour, and tours involve taking a break from the bicycle and eating sit-down snacks and meals.

Have a good breakfast in the morning ... stop at a fruit stand, market, or bakery mid-morning for a snack ... stop at a grocery store at lunch and pick up buns, meat, cheese, and tomatoes to make sandwiches for lunch ... stop at a bakery or convenience store to pick up a snack mid-afternoon ... and get something to eat for dinner and an evening snack later in the day.

When you stop for snacks, lunch, etc. look for yogurt, beef jerky, potato chips, fruit, baked goods, chocolate bars, etc., etc. ... take a walk through your local grocery store tomorrow and see what sorts of things you can find. Many times I've picked up something perishable (like yogurt and certain fruits) on my snack stops, and I've eaten it right there and then.

I usually carry cookies or crackers or something when I ride on a tour, just in case, but most of the time there are enough places to stop to pick up snacks along the way I rarely have to dip into my cookie collection.