Share 'Help - I'm going potty'

Has anyone got a solution to the pot watering problem. Just go away for a few days and your pots dry out and the plants wilt. I don't feel entitled to impose on friends and neighbours, adding another chore to their busy lives, so i need an automatic process. I've bought some of those orange cone things with holes in (they look a bit like carrots) you screw a pop bottle on them and stick them in t…