A lithiated lemon-lime spring water drink. On seeing your bottle, I got interested in the "lithiated" aspect.
The 7Up company included a lithium compound in 7Up until 1948, according to Wikipedia. The usual lithium compound added to drinks is lithium citrate, which is a mood stabilizing drug for people with bipolar disorder. It was also supposed to help with a hangover.
I also note a Christoher Weide webpage which is his ACL bottle wantlist. It seems like it might include your bottle, although it seems a bit ambiguous. If you're interested, you might wish to reach out to him to see what he'd pay for your bottle. The webpage is dated in 2013, so it might be out of date. I imagine that guy has thousands of bottles, so it's a bit exciting to see what appears to be this bottle on his wantlist.