[tempfixit]

How hot was the engine when you put the water in? Even if you don't see water in the oil doesn't necessarily mean the head gasket is ok. Do you see white smoke coming out of the exhaust? Coolant could be leaking into a clyinder and being burned as it runs. Doulble check for any other leaks, amd check your relays for the coolant fans. When you turn on the A/C do the fans come on?