Pink gin and water is also nice. 2 or 3 drops added to a ginger beer is one of my favourite very, very low alcohol drinks. Oh, and one of the several versions of rock shandy is 50/50 ginger ale and soda water, with a few drops of bitters.
A bit of searching and I've found culinary uses at this site

Bitters added to lemonade cuts some of the sweetness and makes a nice summer garden drink.

Is it any good for cleaning shower heads?

[pen] Only if it can dissolve the dead spiders.

That 'Shakespeare in Crescent' game we've just had brought to our notice was pretty good. We must do that again.