Daily large lattes, packaged water bottles and afternoon tea from the corner cafe? North of $7/day. Simple, if surprising, math.
  1. Brew your own darn coffee; steam your own darn milk.
  2. Carry a designer water bottle and fill it from the darn tap. (The stuff you buy isn't necessarily better.)
  3. Carry tea bags.
  4. That's it. You will be rich soon.