When i bought my turbo i specifically ordered a 'series one' turbo as it didnt have any water feed pipes on it anyway. you can however just block the pipes off and there wont be any probs. My water temps are considerably cooler than when i used to have a water fed turbo on the car!
Just make sure you let the turbo cool down/spin out for long enough before the engine is turned off!
CheeRS
Phil