I too have a 2400SCR and it does not have a city water hookup.
It only holds 13 gal so it wont last long, you will quickly learn how to conserve.
We do not drink water from the tank, we use bottled wter for that and a jump over the side to bathe.
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
1976 16ft. Tahiti 2.5 IO (sold)