The English phrase "tank top" is related to this meaning of tank; a tank suit was originally a bathing suit for swimming in a tank, i.e. in a swimming pool.
The word "tank" also came to refer to artificial receptacles for water even of a small size, such as fish tanks. Then, in the early 20th century, the word "tank" was used for containers of liquid fuel, like the "gas tank" of a car. This is also where we get the word "tanker" as in oil tankers.
The use of "tank" to refer to a military vehicle dates to 1915 as a kind of code word, chosen because this new weapon looked something like a benzene storage tank. (Military "tanks" were first used in action on the Western Front of World War I in September 1916.)
The image below shows a temple tank at Chidambaram in Tamil Nadu, India:
