$29 (+ shipping) for less than 2 gallons would be a budget breaker, I imagine. (https://www.organicbuyersgroup.com.a...products_id=49) My #2 son was not able to tolerate milk for quite a while. We had to get the soy milk and soy milk powder which was bad enough price-wise. He's outgrown it, fortunately.
Good luck on your search and hike.