Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How do you fill an ice tray?
Hold an ice tray under a faucet, turn on the water, then turn off the water when the compartments are filled with water.
Fill an ice tray with water up to the fill line, then put it in the freezer.