How much water should I bring?

At least 32 ounces, in a bottle you can open one-handed with tape or wraps on. Two if it is hot.

What matters more is what you drank before you got here. You cannot fix a whole day of nothing in the last ten minutes, and turning up dry is how people cramp, get sloppy and tweak something. See how to avoid getting hurt. Outdoors you need extra and you need shade: see training at a park. If there is a weigh-in coming, do not start playing games with water. See cutting weight.