For time when coffee or soda is too heavy/ distant, what do you use?
What sort of scenario do you have in mind? A sachet of instant coffee and milk powder isn't very heavy. If you don't carry or have access to water to make it with, what's going on?
I'm British. If you can't settle down and make a brew while you figure out what to do next, then I'm afraid you can no longer be considered civilised.