I think they're more asking about getting usable water than energy storage

Supposedly the glued on titanium is the same thing the US Army does for their small Submarines, though I'm sure they found some way to cheap out/fuck up.

The mechanism I actually the whole thing. These ones are designed for cold climates where the pipes are buried deep so they don't freeze. The valve is at the bottom so the vertical section can drain to prevent freezing

Sometimes you just want to be a math problem

Electric vehicles don't have a big engine that takes up space so both the front and back are cargo space.