I cannot recommend a brand but I saw many people on the JMT last summer who had one or two meals a day in shake format. One guy had a small bag of peanut M&Ms and he’d add one to each shake as an edible shaker-ball to help break up and clumps. He used a bodybuilder shake from GNC that provided about 500 calories iirc in a snack sized ziplock baggie.
Same dude also had a bag of crushed triscuits and macadamia nuts that he would dump into a foil pack of tuna with some olive oil at lunch each day. He was a thinker.
I’d like to hike the JMT using a smaller bear canister next time. I’ll definitely be using both of these tricks along with a liberal dose of fats.
Are you a member of the Yahoo JMT group? John Ladd has tons of great information about food and nutrition in their massive library of PDFs. Good stuff.