Usually saltwater.
It depends on what kind of water, because there is gallons, quarts, and more...
That depends on what kind of substance is in the gallons.-- If they're full of water, then they weigh about 126.19 tons. (rounded)-- If the gallons are empty, then their weight is zero.
I don't know of any bees that go under water.
More info needed... Blow up swimming pools come in MANY sizes and each size holds a different amount of water. if a 72 inch round by 12 inch deep pool, you'd normally fill to around 8 - 10 inches water. With 10 inch water depth, it would have roughly 177 gallons of water.
penguin a fish?
a submarine :) xx
Star fishMusselsanemone
Burrows that are partly under water.
Usually they are rated in gallons (in the US).It's probably liters in the rest of the world.
A dodo
The question is not very specific. There are many kinds of water tankers. A water tanker truck, of the largest 18 wheeler kind, can carry about 30 tons of water. Which is about 8000 gallons.