Tap water is salty and not drinkable. Bottled water is widely available at around RM3 for a 1.5L bottle.
Unusually for Terengganu, alcohol is widely available both in convenience stores and the resort restaurants probably because most resorts are run by chinese businessmen, although it's not exactly cheap. A can of beer purchased at a store starts at RM7.8 and a flask of cheap Malaysian vodka at RM15, but the restaurants will happily gouge you over RM100 for a bottle of wine. Self-catering aside, nightlife on Redang is limited to resort bars offering blinking lights and Chinese tour groups belting out karaoke.