Ugh, I'm so so sorry that you've had such a crazy past few weeks. Yay at least to no cancer in the chest! But seriously, I am keeping my fingers crossed for you and hoping that the new meds work and that you'll start to feel better soon.

As for flavorful drink things, have you tried to putting fruit in water like citrus or cucumber slices? My local and semi high-end grocery stores and fancy bakeries/cafes are now selling bottled water with berries, mint leaves, etc. And they can be pretty flavorful.