Any bottled water will do. From about RM1 upwards depending on size.
Some selling in supermarkets are even cheaper less than RM1.
Cactus has a cool logo, otherwise they're all the same.
From cheap to expensive, take your pick. Spritzer, Evian, Perrier...etc
Maybe consider taking your own refillable bottle and use hotel buffet water stations and public drinking fountains. Buying bottled water is unnecessary in most instances.
All the bottled water that can be found in Supermarkets, mini-marts, pharmacies, everywhere is safe to drink. Prices start from around Rm0.60 upwards. Commonly costing about Rm1 to Rm1.40 per bottle. It;s very cheap.