I have another suggestion - home-made Chinotto.
The traditional way to do it is to cut up a selection of citrus and roast it together with cinnamon, coriander seeds, and rosemary until blackened. The blackening caramelizes the sugars and gives the bitter taste. Then pack it into a jar, add a syrup you made with 1:1 sugar and water, and infuse for a month. Strain the liquid out and use it like a cordial. The Italians add it to carbonated water.
My variation is to save the peels of whatever citrus I eat. Leave it to dry on a tray, and when you have collected enough - roast it. It should roast much faster than fresh citrus. Then leave it to infuse. This is a mixture between Italian and Chinese methods and it is great for reducing food waste. There is plenty of flavour in those citrus skins and it is a shame to throw it out.
FYI, Chinese people dry citrus skins and use it in drinks, desserts, and some stews or braises. It is really intense so not much is required. You would be really surprised how much 1/4 of a dried mandarin peel can add.
I don't like drinking any of those commercially available sodas. I make my own. It is so much better - less sugar, more flavour.
(Edit) forgot to include the link. I stole the image from
this recipe.
Also, you can consider making your own Limoncello. It is really easy - lemon, sugar, and vodka.
For Christmas I sometimes make a cherry infused vodka. Also really easy - cherries, sugar, and vodka. You get two products - vodka infused cherries, and cherry infused vodka. Both are amazing.