Eric - No worries, I dont expect people to remember small, unimportant details like that. You are right though, the vegan pudding mix I found at the local grocery store does not contain milk, but requires adding firm tofu to the mix. Because tofu is much too heavy (and dehydrated tofu is hard to come by), this just doesnt seem like a reasonable option.
Tom - Those are good suggestions. I'd really like to find that chocolate pudding mix you're referring to, especially if it only requires adding water or soymilk. I have a ton of soymilk powder lying around the apartment, and believe it or not, it comes it at nearly 200 cal/oz unmixed. I think what I'll do, granting I can't find the particular brand you're describing, is just mix some melted, pure dark chocolate in with a bit of almond or cashew butter. Carrying along some olive oil is another good suggestion, and one that I intend on following. Although it isnt the most appetizing way to go about it, I typically just take one or two small shots per day of oils high in mono- and polyunsaturated fats. Safflower oil will give you nearly 260 cal/oz, and tastes a bit more neutral than olive oil.
I also look forward to adding some potato and corn chips in to my long distance trail diet - something that I usually don't do on shorter trips and try not to give in to at home. 150-160 cal/oz and very tasty....:)
Thanks again everyone,