When we went to Nicaragua last year for 11 days I had my dad water things. He really likes watering! He saturated everything. He claimed he brought one tree back to life which had been doing poorly but I did have problems with some young trees suffering from rot afterwards. He farmed over 1,000 acres, mostly corn, and just says "plants need water to grow, you know!", LOL. I explain to him that they also need air. When we went to Idaho for a week earlier this year I set things up to where the larger trees were crowded in my shadehouse and watered with overhead sprinklers on a timer so that he wouldn't mess with those. My smaller trees I just put in trays and told him how much water to put in the trays and asked him to water just on our 3rd and 5th day away from home. That seemed to work out pretty well.
It takes a fair amount of planning to make sure others understand the water needs of our plants, that's for sure. Of course, if you don't have someone that give any priority to watering them, you've definitely got bigger problems.