Most hikers are used to caffeine in the morning. Interrupting that habit makes for grumpy hikers who are not the best trail company. Caffeine pills help, but do not provide the same emotional (some would say spiritual) comfort of wrapping your hands around a cup of soothingly warm liquid.
Coffee has the disadvantage of oily, hard-to-clean residues in your cup and pot. Ground coffee only keeps fresh for a few days at most (some believe it is only minutes or hours after grinding).
I make tea. Loose leaf teas like Assam, Darjeeling (black tea) or Sencha (green tea) keep for months in the backcountry and are a cinch to clean up after. Here’s a five minute tutorial video about making loose leaf tea in the backcountry (about 19 MB)
Backcountry Tea using the Trail Designs Caldera Cone Stove cooking system