Your best choice is spirits and a diet mixer.
I find that most places don't tend to have diet lemonade, so I usually end up with Diet Coke and Malibu if I'm watching what I'm drinking (2.5 Syns per 25ml)
But soda water is free, so you can always have that too
Vodka is 3 Syns per 25ml
Bacardi is 2.5 Syns per 25ml
Whisky is 3 Syns per 25ml
Any other drinks you might want?
Wine is always high. 9 Syns for a large glass at least.
A pint of lager is usually 11.5 Syns for 4-6% abv
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