I was taught that a true Long Island Iced Tea is seven (?) white liquors with no sour, tea nor cola, and the taste can be quite convincing. I say, experiment until you figure out the right proportions. Something like
- Vodka
- Tequila
- White rum
- Triple Sec
- Gin
- Vermouth?
Here's a recipe (or two) that utilizes only lemon juice and simple syrup.
This is a good "at-home" experiment, because they have to add mixer of some sort in bars.