Very cool! I hope you don't mind, but I liked your idea enough that I thought I would have some fun and try it myself.
This first one is a water bottle with the green LEDs of my Streamlight Twin-Task 2-L Buckmaster.
This one is the same light on incan mode...
This is the incan through the lid of an orange juice gallon jug...
And the same light through the bottom of the OJ jug...
One gallon water bottle...
Jim Beam bottle...
Some artsy bottle my wife bought, not really sure what is in it, with the Twin-Task shining through it...
The same artsy bottle with my 4D Mag with Mag LED...
Fun stuff. I may have to try other liquids and other bottles just to see what kind of pics I can get.