Water in Kuala Lumpur

Hi,
I do not feel comfortable drinking the water from the tap and I wonder if anyone can recommend a water delivery company. I am not interested in these build-in filters because there are way to many issues with filters. So I am looking for one of these companies that do deliver a a water cooler and these 20 liter drums of water to my house. I googled it already and found some but I wonder if anyone has actual experience because as usual on the web everyone claims to be the best ;-)