Week one I bought a cheap scale from wal mart. I drew some art on it and brought it to the hot room everyday so everyone could use it to weigh in before and after each class. It become a fun ritual I highly recommend it. I wanted to see how much water weight I was losing per class to help with the hydration.
Average class was 3-5lbs
If it was a scorcher in there 7-9Lbs no joke.
I told you I sweat like a damn pig. I wasnt the only one.
The group in general seemed to lose anywhere from 2-5lbs of water weight on average per class.
One gallon of water weighs 8lbs-in the hot classes I was sweating out over a gallon, sounds gross but very liberating thank you.

Your electrolyte\water mix is a delicate balance that you need to figure out.
It took me a few weeks to really dial it in but heres what I came up with.
There are a lot of different options out there and around week 2-3 its like a big electrolyte mix convention, everyone is so siked to let you try thier concoction of home brewed super gatorade or whatever.

First thing you need to do is just go ahead and buy an Insulated one gallon water tower of shame. Just do it, trust me. The early you accept the fact that your gonna practice with this one gallon monster next you, the better.
Pretty much everyone had one by the end. No shame sister!

You cant just drink a bunch of water and think its gonna work because you need electrolytes which you lose when you sweat. In particular Potassium and Sodium. Once you get low on those, you cramp, get headaches. no fun.

You can also drink too much thats why you need to experiment. You wanna always stay hydrated until your pee is clear but only to an extent. Sometimes youll drink a ton of fluid at training and not pee for hours cause your body is playing catch up. Hate to keep talking about pee, but hey just wait to see all the stuff you guys are talking about around week 6. Your pee is your best guide to your hydration. Keep it on the clear side.

I tried several recovery drinks weeks 1-3. I tried endurox R4 which Id take right after class but it has too much sugar in it.
I always drank coconut juice during and after class but needed something way more awesome.

Heres my mix. (this was per class)
One gallon water tower of shame.
2-3 Zico coconut waters (potassium, natural sugar for glucose stimulation)
2 oz of Organic Aloe Vera juice(allows your body to absorb nutrients 200 times faster and hydrates your internal organs)
One lemon and One lime cut into the slices youd stick in your Corona or Pacifico.
Slices of fresh fruit, watermelon, pinapple, apples,oranges, switch it up each day
Two teaspoons of Sea Salt(Himalayan is a good choice)
a little over half of the jug would be filled with ice-after everything was added, top it off with water.

During class I only drink at the common times. Party time, 1st savasana and then a sip or two around camel. I would drink the bulk of it after class and then you can open the lid and eat all the ice cold fruit, share it with your friends and stick around and stretch, try new yoga tricks, I miss my after class peeps!

Once training was over, I had gone through 42 cases of coconut juice.
Its the nectar of the Bikram Yoga gods and you should drink a ton of it. Its Natures gatorade.

So yeah, like I said, there are lot of different combos for electrolyte replacement but you should try to get these naturally. Avoid powders, sugars and all that other crap that you can get from good ol mother nature instead.