Can a water-filled swinging sphere be analyzed as angular simple harmonic motion?

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If all things have moment of inertia then a swinging sphere with water filled must have moment inertia too? Then can we analyse it as an approximate case of angular simple harmonic motion?
 

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Sure. Just don't forget that if you rotate the sphere, the water will heavily impede the rotation.
 
ideasrule said:
Sure. Just don't forget that if you rotate the sphere, the water will heavily impede the rotation.

I can't see how water will impede motion.
Anything to do with viscosity?