Welcome aboard, fellow May traveller!
First few days are the worst, but it gets better, a lot better. You're going to have to re-wire your brain to get healthy and purge the nicotine. If you're bored, even if you're not, read all you can in these pages, a lot of gold is thrown around in here. As you already said, drink all the water you can, exercise. Stock up on chewing gum, mints, fake dip...whatever floats your boat. Keep stuff in your vehicle, golf bag, gym bag...never be away from your 'replacements'.
You can do this!