there should be water fountains all around Melbourne Park.. I never had problems refilling my water..
you probably won't be able to get Rod Laver tickets straight after the schedule is released.. they're probably sold out by then...
keep an eye on the Ticketek website just hours before the actual match though, and you'll see some seats popping up..
scalping is heavily frowned upon for AO.. so you won't see scalpers hanging around the park.. what people usually do when they can't go to the matches is return the tickets to Ticketek..
got good seats for Fed vs Tomic last year (sold out match, 7th row ticket), and Nadal vs Berdych
not a guaranteed thing, but better than nothing..
Wilson Kobra Tour, Wilson BLX Six.One 95, Babolat Propulse 2