What's the difference between diuretic veggies and alcohol that make the latter bad?
Firstly I would suggest if you have concerns about suffering from symptoms fluid overload you should consult your doctor. Self diagnosis and self treatment is not a good option. 

In terms of alcohol being used as a diuretic, you have to bear in mind that there are many deleterious effects of excess alcohol. By consuming alcohol as a diuretic you would most likely cause more health problems than you solve.