Never limit or hold back drinking water. Generally there is no need for added salt or Gatorade for a 60k ride. If it was a 200k ride I'd say diluted Gatorade in one bottle only (the remaining bottles just water). Drink plain water in small amounts constantly. That bloated heavy feeling may come from drinking too much water at once. I to get that feeling if I guzzle more than half a bottle. Depending on heat, humidity, etc plan on one full large bottle every 30 to 60 mins.

For a 60k ride I take a minimum of three large size water bottles and probably two more in my jersey pocket. It's better to have too much than too little and hit the wall.

The secret is to take in as much or a little more than you are sweating out. That's why it's important to constantly drink. You don't sweat in batches do you? Right, then drink a constant flow. If you stop sweating, it's too late. You're already behind in your water intake. If you get there, drink smaller portions of water at more frequent intervals (two big swallows every 5 mins or so) in an attempt to keep up with the out-take of water. Remember that your body processes plain water much more quickly and effectively than Gaterade or other drinks.