Shoot, shovel, and shutup.
Go at least 6 feet down and a couple hundred feet from your water source. Don’t use em for fertilizer.
You could feed the crabs, wild hogs or gators if you’re in Florida. That would save ya the shovel part.
“Go at least 6 feet down and a couple hundred feet from your water source.”
If you overcome 3-5 attackers who weigh 150-220 pounds, and you don’t leave any survivors to lead others back to you, your way means an awful lot of work when you’re already resource constrained and have other things to do.
I suppose you could make preparations with a backhoe before the SHTF, but there would be problems there to.