Slip a penny into the glass. Does the water spill? Probably not, because a penny isn't very big and doesn't displace much water.
How many pennies do you think it will take before the water starts to spill over the lip of the glass? Ten? Fifty? Somewhere in between? Something higher?
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Water molecules hold onto each other tightly. It's called surface tension.
Now consider what happens in space. To help you out, Canadian astronaut Chris Hadfield. He shows what happens when he tried to wring out a soaking wet washcloth. Note: washclothes are packed like hockey pucks for their trip into space!