Lowest calorie alcoholic drinks

Whisky. Generally just with ice. But you could also add water.

I recently discovered this: http://www.socialenjoyments.com/shop-social--social-enjoyments.html
On the package it suggested trying it with a 1.5 oz of vodka and some cucumbers. I thought it was a little strong. With 1 oz of vodka and some cucumbers it was about 160 calories. By itself it is 88 calories and very tasty!

I prefer wine (usually around 125-150 / 5-6 oz or 25 cals / oz) or light beer (under 100 calories for 12 oz). Some would point you to hard liquor since the calorie count is often "lower", however that is typically for only 1.5 oz (a shot) and not mixed with anything (note: most liquors are around 100 cal / 1.5 oz); Once you start looking at mixed drinks, the calorie count is typically much higher (often 250-500 calories) due to the mixers (sodas, juices, syrups) or multiple shots of alcohol they use. But whatever fits into your calorie count/goals and macros is what can work for you.

ETA: I did just see on one website the recommendation for flavored vodka (mandarin orange, etc) and club soda, which would be essentially 100 calories since the club soda has 0 calories. Sounds interesting, and I may have to try it.

Generally the light or
Clear spirits are the best bet for lower calories with the least amount of additives and fat. Spirits such as vodka with a diet soda or sparkling water and lime.

the Bai sparkly waters have a nice flavor for mixer and are almost no calories.

Vodka coke zero or vodka soda with lime (if fruit not cordial)

Shots. Drink water or diet soda in between to keep "social."

Vodka/soda or Vodka/water (can add flavored Crystal Light or lemon). If you don't mind diet drinks then I also suggest Vodka/Diet Sprite and Bacardi/Diet Coke.