There are two great fun prepping documentaries, possibly still on Netflix.
The US one had a guy who had bought an old Pershing missile silo in Texas. He had a 5 mile perimeter which was pressure sensor and camera strewn, the road in was about 3 miles long and had armoured checkpoints. The place had several LW, SW and VHF radios and antennae strung all over the property to ensure decent coverage. He had his own endless secure water supply, an impenetrable nuclear bunker with a 5 year air filter, 5 years of tinned and dried food for 6 people, about 250 guns and hundreds of thousands of rounds. He had an underground invincible house that was designed to house over 150 people.
The UK guy had access to a rubber dinghy, which he planned to paddle to a small island in the middle of a river, which had a little shed on it. He had an air rifle, a tin of pellets and a crossbow buried on the island with some tins from Tescos and a CB radio.