How long will u b gone? I have a relable watering method that is simple and easy to do! I think your overthinking this from the pic I saw, first,I collect empty wine bottles 1 for each plant per week away,right before leaving water normally and place full bottles upside down keeping thumb over hole so not to clog, I make the holes ahead of time the bottle will not drain until plant has used up what’s in the pot, I average a week per bottle. Your mileage my vary, and the size of the bottle.Cheers🎉