You know theres two things that piss me off when someone asks a question about another drug; The fact that the poster likely did no independent research before asking, and even more so the people who try to discourage the use of this drug or tell them to just smoke weed.
The reason for this is that I seriously doubt ilovebecky or Zandor have tried MDMA, or know much about it besides the standard 'eats holes in your brain' bullshit the government feeds the public about every drug. (The myth by the way was the result of misinterpretation of brain scans that measures the amount of the neurotransmitter serotonin in the brain, further propagated by flawed research done by George Ricaurte)

Unless you plan on being outside or active don't worry about drinking so much, the risk is of dehydration and it isn't a risk unless you're sweating a lot. Just keep a drink around, sporks drinks such as Gatorade are best as they also contain electrolytes you loose in sweat.
Individual reacts vary, especially since you can't be sure what is in your pills. Real good ecstasy generally makes you want to sit on your ass and embrace life. Music makes the experience more enjoyable, outdoors and public places as well.
Eat good the day before you roll and lightly the day you do it, you probably will not feel hungry during or even the day after. If you can take a vitamin pill like Centrum or something.
Good pills can last up to five hours, smoking during the peak I find intensifies and prolongs the experience as well as makes it feel more like I am tripping.