Yeah, I did add “water” to the title for total clarity, but the OP include the Waterboy GIF with “H2O” as the focus, so it wasn’t exactly lacking entirely from the original context 
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Was it not Lionel Sanders during his Kona prep that found out through sweat rate testing that he needed to consume 2L/h … crazy! And, as you know, he’s a committed fellow
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I have no idea on LS because I don’t follow him or his shenanigans.
Anything is possible but as you note, that’s a TON of fluids and looking more at the Kona side of prep it seems atypical for day to day training. I am not sure how I could even get that much fluid down (over 1/2 gallon) in that time without a hydro pack practically setup as an IV bag the entire ride 
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When I originally made the post I did have this part:
Don’t know many people that are cracking beers or mixing cocktails on the bike indoors.
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After a Friday night workout on the trainer I like to think of a cold beer as my carb recovery drink of choice while cooling down 
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Early season riding, when it’s -5c out, the answer is one bottle every 2-4h.
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Now we need to know if you have 4 before you unclip!
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From my past experience playing football in -10C in Saskatchewan
When the temperature dropped coaches always had to have a talk with about the importance of hydration since it is harder to remember to drink when you are not sweating.
In recent days I have started to take on carbs from the bottle to train my gut so for me I need to drink that entire bottle to meet my carb/hour needs.
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I wonder how many who don’t drink much are training in an air conditioned room?
That’s me!
If it’s a soul crushing workout I might go through 16oz. Often though I might go through half a bottle. But I blast the a/c and have a fan on me. And to add to that we had new a/c units installed 2 years ago and I had them add an extra vent in my office/pain cave.
Do others drink plain water or drink mix for workouts up to an hour?
I definitely drink more training than I do throughout the day otherwise. I keep 4 24oz bottles on a shelf nearby with 2 being my typical 1.5 hour consumption. Some easier rides I may actually drink more probably out of boredom. It is not unusual for me to dip into bottle 3. I have an extremely well air-conditioned room. Indoor AC plus 4 Lasko fans and usually have them all on by the time things get real.
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I fuel every workout. I’m also not small. Related? 
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I don’t generally do much special before my workouts unless I know it’s going to be a killer. But workout right after work so late afternoon I make sure to eat something
I get all my hydration from food I eat, like a cat
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I am small and I fuel every workout.
I just learned I do better if I fuel. I gave up explaining to others. It really becomes apparent when I have no trouble doing a 3-4 hour ride without stopping and they insist we take a break for 30 minutes. Then they eat something.
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I’ll drink 20-24oz /hr doing endurance or harder on the trainer in the summer (hot garage rides). Maybe a bit less in winter.
I was riding in TX in the summer drinking about 50-75oz /hr through a hydration backpack.
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I probably do not drink enough, honestly. I may not even finish a bottle on an hour ride. On an hour and a half I can finish one, but I also have my nutrition in the bottle.
I keep my house cool (which is easy in the PNW) at 63-64 degrees and I have a good fan. Any warmer than that I open a window to bring even colder air to the fan.
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For my 1.5hr hard rides I have 1 bottle of water and 1 bottle of “fuel”.
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After the last few training sessions, I had a feeling of salty lips after training.
What can this mean? Too little fluid or maybe too little electrolytes or sodium?
I did a 2h workout - warmup + 1x 60 SS + 1x30 SS + freeride in zone 2
I drink 750 ml of hydration mix an hour when riding. I’ll do 2 scoops of Skratch indoors or 3 scoops if outdoors (Florida) except in winter where its 2 scoops either way.