When I hike I drink alot of tea, chai style. Trick is not to scald the skim milk powder, which makes it lumpy. I use black tea and add my own spices, which are also spices which go well with oatmeal. Sometimes I make my oatmeal and chai at the same time, so I get chai flavoured oatmeal and oatmeal flavoured chai. I drink chai as I go.

Spices for chai, and oatmeal:
Cardamom, Cloves, Ginger, Anise, Black Pepper, Cinnamon
also Nutmeg

The extra containers add weight, but it is nice to be able to make it a little differently each time.