My two teenage boys......
I threaten them before I leave...
They are actually pretty good, I have never had any issues. With my freshwater tank, I put the dry food into containers measured out and all they have to do is open lid and dump they never over feed that way. For the frozen foods I have it all measured out so they just feed as I say with that.
When I had my 10 gal nano the biggest thing was top ups, they were really good with both that and feeding was done the same as the freshwater.
Now I have a 1 gal pico so the top ups are more frequent and we just went away on a cruise for a week and everything was perfect when we came home. We will be going on a 14 day Hawaiian cruise next and they will do the same.
I don't get them to do water changes, would never do that. I just cut back on the amount of food while I am away.
I trained them early in life.....
Good luck
Amy