Boy, if I had to do all that alarming and securing, I'd sell the place and move. Also, any internet enabled security system requires you to leave your internet on. That's an expense you really don't need.
Turn off the water and set the heat to 50 or 60 if you have a newer high-efficiency furnace. Water heater off (vacation mode still burns gas).
If you have forced hot water heat, you will need to provide makeup water to the boiler. Most people have a separate line for the boiler that allows you to isolate the rest of the house. Route any P/T valve overflows for a sump with a pump.