In the north of France, there's a thing sold that's "beer bitter" which is a bitter alcohol specifically for adding to beer (Picon being the most common one).
The true purpose is probably mostly to add alcohol though. But it does taste nice.
As a PNW beer snob, I used to make shandies out of the Ranier 30 racks that would be left at our house after a party. I didn't like the beer at the time and mixing it with lemon San Pellegrino made it delightful.
I now drink Ranier proudly when I can since I moved to Chicago. I love this city but I still bleed green, white, and blue.
I'd seen colaweizen plenty of times when I was in Germany years ago. But then this guy walked up to the bar and asked for a Fantaweizen. That was new for me.
Shandies are called Radler in Germany, and many hate them so much that there are well known songs hating against them. To be fair, they are songs you'll only hear on parties, after a few shots and beers, but still.
A Radler is a German thing, shandy in English. Basically half lager half lemonade. Fantastic light drink. I've seen them at Total Wine in a few flavors.
Tea does not mix with anything but sugar and fruit, and I will die by that. Twisted Tea is an abhorent product, and the creator needs a catholic exorcist.
If it’s the USA, then “iced tea” may actually mean “sweet tea” (an American South tradition), which is often prepared something like this:
bring 1/2 gallon (1.9L) water to a boil
place 8 large black tea bags in a 1 gallon (3.8L) pitcher
pour boiling water over the tea bags in the pitcher
steep 10-15 minutes, then remove tea bags from the pitcher
add 1 dry cup (220g) granulated sugar
stir the slurry until sugar is dissolved
fill the pitcher to the top with ice cubes
wait 20 minutes for ice to chill and dilute the tea, gently stir again
serve
It may be a stronger tea, but so much sugar gets added (probably 3x what would be used to sweeten tea served hot) that you typically don’t notice any bitterness.