What alcohol do I have a lemonade and sweet tea bar?

I’m hosting my 21st birthday party and I plan I have a lemonade and sweet tea bar for drinks. There’s going to be about 20 guests and I’m trying to figure out what alcohol I should have to make spiked drinks. The entire idea is like a make your own cocktail bar with all the ingredients and flavors the base is just prepared. I do plan on having seagrams, smirnoff ice, maybe like twisted teas or something. Essentially do I get a variety of those single shots in lots of different flavors or just stick to like vodka and maybe crown?