The actual comestibles you include in your brew kit are limited only by your imagination. You can get most drinks in individual portions although, outside of teabags, it can be be an expensive way to buy stuff. Small resealable bags can be bought very cheaply on ebay or at your local market, as can small plastic bottles (IIRC, Richard linked to some the other day), and you can decant your favourite coffee, or whatever, into these containers.
Aldi or B&M or Home Bargains (can't remember which - Mrs Bilmo gets 'em) sell fruit in little ring-pull cans with a resealable lid and attached folding spoon. The empty cans fit many camping mugs like they were meant to and make useful containers for your brewkit items. With a little thought you can make room for a simple firekit as well.
