Diluting alcohol (specifically vodka)

If I dilute my 1.75 liter bottle of vodka, does the alcohol stay on top? I am trying to get my husband to cut down for health reasons - but he is sneaking my vodka - so I figure if I dilute it, he won't get as much alcohol. I want to know since there is...

only one bottle, if I should shake it up when I pour mine? He mixes his with cola, so he should not be able to tell the difference. He would know if there were 2 bottles open. Tried that.

If your husband is unable to to cut down on his drinking without help but you are not willing to cut down on yours, congratulations, you're officially an enabler.

But I won't judge your hypocrisy. Not my place. I will, however, judge your bizarre reasoning that vodka mixes with cola but does not mix with water, or the idea that someone won't notice that their drink have suddenly become watered down.

Speaking from experience, he's going to know if the alcohol is not the same. He's got an alcohol problem quite obviously, and he's going to know if his alcohol is not as strong. Try doing this through a more direct route because if he isnt getting drunk off 7 drinks, then he'll just do 10... Trying to water it down is not going to do any good.