Question

why does the water spill out when you tilt the jar to the side?
gravity starts working again.
the hydrogen bonds break.
magic

Explanation:

Gravity is a constant force acting on water. When the jar is tilted, the jar's wall no longer supports the water against gravity, so gravity pulls the water down and out of the jar. Hydrogen bonds breaking is not related to spilling, and "magic" is not a scientific explanation.

Answer:

Gravity starts working again.