Can you drink alcohol or beer if you only have one kidney?

Alcohol is a diuretic, meaning that it causes dehydration. The liquid in beer is not, by itself, sufficient to replace the water that alcohol removes from your system. Drinking large amounts always results in dehydration, which is one of the major factors in hangovers.

As you are no doubt aware, people with reduced kidney function, or a tendency toward kidney problems (or, in your case, with no spare to depend on) need to be especially careful to keep themselves hydrated. That applies to hot weather, exercise, and also to drinking. One should drink plenty of water along with whatever alcoholic beverage they choose.

So there are the facts. You will have to answer the question for yourself.