2 Now there was no water for the community, and the people gathered in opposition to Moses and Aaron.

Read Numbers 20:2 Using Other Translations

And there was no water for the congregation: and they gathered themselves together against Moses and against Aaron.
Now there was no water for the congregation. And they assembled themselves together against Moses and against Aaron.
There was no water for the people to drink at that place, so they rebelled against Moses and Aaron.