You need about 1 gallon of potable water per adult person per day. For 6 months and a household of three people, that would require 540 gallons (2052 liters) of water. That's about 110 water-cooler sized bottles of water.
I'm not sure where in your home you would fit that. A small swimming pool would easily hold that, but keeping the water clean and potable would be very difficult. I would guess you'd need to have a special water tank made, and to avoid detection or damage, it would probably need to be underground. How the water would stay drinkable is another challenge.
Just saying that the logistics around long-term survival appear to be daunting and expensive. Maybe those "crazy" survivalists are not so crazy after all.
For water, you probably have much better luck finding a place (home) next to a natural spring, while leaving the storage available in your home/bunker to food rations and other supplies.
I'm not sure where in your home you would fit that. A small swimming pool would easily hold that, but keeping the water clean and potable would be very difficult. I would guess you'd need to have a special water tank made, and to avoid detection or damage, it would probably need to be underground. How the water would stay drinkable is another challenge.
Just saying that the logistics around long-term survival appear to be daunting and expensive. Maybe those "crazy" survivalists are not so crazy after all.