Watering outdoors...
I guess it would depend on how much it rains where you are, but for me guerilla means minimal care/work, don't think I've ever watered more than a half dozen times per season.
This year for example I'm at 3 weeks, and only watered once when I set them in the ground. I was actually a little worried they might drown in their first week it rained so much. If it don't rain for a few days I'll think about giving them a drink.
Nutes, there will be a lot of theory on that one, but again guerilla style if you got decent soil with some compost to start with your pretty good. I confess to actually throwing on a splash or two of some generic stuff, I doubt it makes much difference. I'll put it this way, if you really poor soil conditions, no amount of nutes will make up for that.
I have no pictures of the past, but have grown pound plus plants from a june 1st start, visited once every two weeks.