Gin could be arranged, although it's not something I normally drink. But plainly I could buy a couple of crates of gin and the bitters would still outlast them. And a bottle of gin would lakst me 3-6 months. Y'know, I was viewing using up this bottle of bitters as a challenge, but unless I really go for it, which is sort of cheating, I don't think I'm going to manage it in my remaining lifespan.

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.

[Simons Mith] When I was a student, one of the drinks of choice at the time was a long vodka which consisted of a few drops of bitters smeared round a highball glass, ice, a shot of vodka, a dash of lime and topped up with soda water. A bit girly but very drinkable.