How much? ALL! 
Honestly, when I start loose weight(mainly muscle-mass), my water consumption decreasing.
Less mass - less sweat.
Besides, I use water to wet my throat during Vo2 intervals because of heavy breathing. Consequently, I have to stop to take a pee-break. 
Water intake is a difficult part of cycling. 
Probably around 500ml/hr for me. Iām on the smaller side and donāt sweat a ton.
More during tris/brick workouts because while i am running I like to not drink until I die.
Sure, edited the title after I respondedā¦ Win some, look silly later some.
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Yeah, I did add āwaterā to the title for total clarity, but the OP include the Waterboy GIF with āH2Oā as the focus, so it wasnāt 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 ā¦ crazy! And, as you know, heās a committed fellow
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I have no idea on LS because I donāt follow him or his shenanigans.
Anything is possible but as you note, thatās 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When I originally made the post I did have this part:
Donāt 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 itās -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 donāt drink much are training in an air conditioned room?
Thatās me!
If itās 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. Iām also not small. Related? 
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I donāt generally do much special before my workouts unless I know itās going to be a killer. But workout right after work so late afternoon I make sure to eat something
4 to 4.5 litres a day is the answer to the question I thought was going to be asked.
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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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Iāll 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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