So sorry to hear about your tank and fish. I am soooo lucky with my two boys even though they could not care a less about the fish tanks, but they know what will happen if mom comes home and disaster has struck. They always phone us to if there are any doubts. But back to your situation.
When I go away I always have water ready for the tank, now i have a 10 gal so I am dealing with alot more risk here. I have put a black line on the water level to where it should be kept at all times. They check this everyday and top up if needed to bring to that line, they know that it cannot go below this line either. It has worked great even when the moth-in-law has come to do this.
Feeding, i use the empty camera film containers. These are worth their weight in gold. I put the right amount of dry foods into these containers so all they have to do is open and dump one and can never over feed. The frozen foods I have all sectioned out in the freezer and they just do the same here and add one of the frozen foods. I have never in my 4 years of this hobby come back to any type of tank disaster and that is even with my Freshwater Discus tank too.
Hubby and I travel quite a bit in a year, I guess I must have good fish keepers even though they don't like fish.......
Hope your tank recovers so you can carry on with some new stock.Hey what did you have in there for fish, inverts and corals before this all happened??