If you have OCD, try the airhose method. It's kinda makes me feel Zen when doing it. You feel you are busy the whole time as when I do it I keep the stiff part of the hose constantly moving from left to right over the soil. Even when I'm watering my 24 P1's in the White Widow project, I do the same thing, watering in 5L of water, with molasses, bennies and a bit of something else in it. Every time I do that. It takes me about 20 minutes to water all that in.
5L devided by 24 pots is about 200ml per pot. I'm even so OCD that each pot will get the same amount of movements over the soil as to be sure each pot will get the same, lol