On long trips I get beer at the last town I go through before I camp. Just pack it in wherever it will fit (I have a large tank bag) It can be a problem in remote areas, some towns on the map dont have any stores, and some states and counties have weird laws, so the pint of whiskey in an aluminum flask is the emergengy backup, to be had neat or with water. I do prefer a good IPA(or 6) any day though.
If there is a creek nearby, put it in there while you set up camp and it will be nice and cold by the time you are done.
The pot idea works well too, but may cause a problem with LE and employers, I sure do miss that stuff sometimes.