I am lookinbg at building some redundancy or insurance into my watering system when i am away for a few days. Usually i get a friend to water once or twice a day but should they forget a day in the heat of summer we all know this could achieve some bad results. I want to build a basic automatic watering system to water on top of the watering done by the elected waterer. This way if either one fails the other should take up the slack.

I am looking at using some form of automatic timer and was wondering if anyone had any experiences good or bad with any styles or types of timers that might help me decide what product to choose. I will only be doing a small area and it will probably run from a garden tap if that helps.
Are there any timers out there that are no good or any that are excellent for that matter? Any style to use over another? thoughts?
Joe.