A droplet of liquid falling from a tilted glass test tube.

Liquid Drop From Tube

A row of three identical plain drops or flames.

Three Drops Or Flames

A battery with a curved cable plug and a big water drop.

A water droplet that is wider at the bottom and pointed at the top. 

A side-facing watering can with water drops.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.