Trader Joe's (I swear I feel like an evangelist for that place sometimes) had something with a small amount of real juice in basic seltzer. I'm one of those people that for whatever reason cannot do artificial sweeteners. It's either the full sugary/syrupy version of a soda, or 0 cal seltzer without the sweetener (plain or with a flavor, the basic lemon-lime or mandarin orange has always been fine), so I gave it a shot. It wasn't bad! It's more bitter than seltzer, though I drink black coffee more than any of the above combined, so, uh, needless to say, that's not a huge issue for me!
I can deal with LaCroix but never got into getting it regularly. It's a good switchup to one of their more exotic flavors once in a blue moon, but I stick to the non-sweetened types.
That 'thirstier than when I started' is dialed up to 11 with me for all the artificial sweeteners, even in colas/etc. I'm that person that would rather have a can of 'real sugar' pepsi once a week than the artificially sweetened anything all the time.
(This is kinda what we do.) It's more like 111 with the 'zero calorie sweet seltzers'. My mother was super into them for a long time (and my husband still is), so there was a period of years in which they'd have me try 'the best thing ever totally can't tell it's artificial!' yet again and I'd have a sip then immediately fill a cup with ice and need to wash the taste out of my mouth with three ice cold glasses of basic filtered tap water.
I may be misremembering this, but I think there have been studies on some of the sweeteners and the 'thirstier than when you started drinking' factor.