This is not currently possible, so you’ll have to recolour the water in each frame.
The feature to allow per-frame palettes (allowing for colour cycling) is planned for 1.3, according to this thread: Color cycling effect?
This is not currently possible, so you’ll have to recolour the water in each frame.
The feature to allow per-frame palettes (allowing for colour cycling) is planned for 1.3, according to this thread: Color cycling effect?