Let's face it, tea sucks. Mostly because it takes up a ton of inventory space and can't be refilled when you're out in the woods. To address that, I propose two things:
Thermos bottle. Takes a glass bottle, a bar of tin and some feathers (for insulation) to craft. Holds 2l of tea and the bottle's cap doubles as a cup (abstracted so you can just drink straight out of the bottle).
Tea box. Carved out of a block of wood, maybe requires a common metal nugget for the hinges. Can hold 50 dried tea leaves, and teacrafting can draw leaves straight from it.