When traveling outside the U.S., I miss being able to get iced tea. Although Starbucks sells a version of cold tea, it is priced like their premium drinks, which seems excessive knowing how little it costs them.
I have discovered a work-around of sorts: cold brewed tea. Through trial and error, I find I can make decent cold tea by putting two or three regular black tea bags in a 500 ML (approx. 16 oz) bottle for some period of time. Eight hours in a refrigerator is best, but shorter times probably work, too.
Lipton sells a family sized cold brew tea bag in the U.S., and the instructions say only 5 minutes of immersion is necessary. I haven't tested that out, but leaving the bags for hours doesn't create too strong a tea taste. (They price the cold brewed tea higher, but I can't tell the difference with "regular" tea.) In a pinch, when a refrigerator isn't handy, leaving the bags in an already chilled bottle of water for 10 minutes or so should still create a reasonable facsimile of iced tea.
The bags fit in the neck of the bottle if they are turned sideways and all the tea is shaken to one side. Carefully pulling them out one at a time keeps them from spilling out the tea leaves.
It isn't perfect -- hard to find ice sometimes -- but it comes pretty close. It is good enough that I've given up brewing tea at home. I just take some family sized tea bags and put them in a container of water in the refrigerator overnight.
One caveat: I like my tea unsweetened. If you want to add sugar, it probably helps to boil water and brew the tea that way to get the sugar to thoroughly dissolve. I don't know for sure.