There are loads of ways to make water. Lots of chemical reactions make water. My favourite way to make water is to burn hydrogen gas: when you burn hydrogen gas the hydrogen (H) joins with oxygen (O) in the air to make water (H2O). It also makes a loud bang too!
Water is made of molecules which have two hydrogen atoms and one oxygen atom. To force these atoms together to make water molecules you need a chemical reaction like the one ben describes.
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