When it comes to a sensitive subject like your memory, you want to make sure that you know all there is to know about it. Practicing good methods towards a fine-tuned memory can be hard at times, but it's how much information that you know that can help, so look at this article to see what you can learn.
To remember things like turning off the water, place some object that will remind you in a place where you are likely to trip over it! If you have left the sprinklers on for half an hour while you go inside to eat, put your garden gloves in the kitchen sink or some other unlikely place. This will remind you to turn off the water!