Local grocery store has advantage card program, every month or two i
earn a free tank of gas up to 30 gallons.

I ALWAYS get 30 gallons my van holds near 20 but i dont like to run it
low, gas pump in tank, the gasoline cools the pump. so i try to never
need more than 17 galllons.

which leaves 15 gallons or less to bring home.

i buy gas at nearby station and drive directly home. gasoline goes in
my shed it has power but its well vantilated.and in a fenced in yard.

i have stored over 30 gallons in those 5 gallon plastic cans.

you could use one of those tiny yard storage buildings or a garbage
can over a couple of 5 gallon cans but a weight on top.

life is full of risks its imposible to avoid all of them, far better
to not stress so much.....