The Studio Novice, Shooting Liquids

Most photos of liquids would be back-lit meaning that the liquid is lit up like Broadway. As the neck of the bottle thins the amount of fluid the light travels though lessens meaning that the light is brighter at this point.

For some drinks or liquids this can add to the shot, but what if you don’t want this ?

What if you want the consistency of the liquid to be the same top to bottom?