Just started Tesa last week, and I too can feel the water weight. Prior to the GLP1 adventure, I have been taking hydrochlorothiazide for years as a first-line blood pressure treatment, and when I would forget to take it, the biggest sign would be edema in my ankles. With Tesa, it feels very different, I can tell the water retention is in my core. Subtle but weird feeling.
Anyway, first few days I would have to piss very frequently, peaking every 30min for a while, and no longer than 4hrs at night. It seems to have settled out to 3-5hrs but that's still pretty bothersome. OTOH I can tell the fat metabolism from Tirz/Reta is continuing by the color and smell, so... yeah, bad water out....
(FWIW, Tesamorelin 2mg + 0.2mg CJC1295noDAC + 0.2mg Ipamorelin, nightly a few hours after last food. Aiming for reduction in visceral fat/too much torso stuffing in the bear. I can feel bodily conditions changing, but it'll be a few weeks before I have some sense of the effect, and can connect the sensations to the outcomes. Weird to watch and wait.)