Holidays. How long can the reef survive?

[vertex]

I don't want to "have to" arrange a tank sitter. I like to dissapear in the summer to the cabin at a moments notice when the wheather is good and I don't want to have to worry about the tank. What kind of auto feeders are available? Are they just for flake or dried foods?

I guess an auto top off will be my next DIY to avoid that problem. Now to find some float switches.....