I was also thinking of setting my water pump up to a Wi-Fi plug as those are the only timers I have found that have can be set for any amount of times, any one used one?
I've used X10 which sends the commands over the power line.
Currently, I use Permanent Industries' "Multi Function Programmable Timer outlet Count Down on and off timer Infinite Loop timer in second timer outlet indoor outdoor min setting 1 second in loop timer controller" as it's described at the online malls. For $20 CAD you get a timer that you can set down to the second, one to three times per day. It's the most versatile off-the-shelf timer I've found.