This is about as simple as it gets, proving sometimes the simplest things are the best. While it's relatively easy to make, I do recommend using a higher quality Gin, as you can certainly taste if if you don't. It's also fun to experiment with different tonic waters as they now come in may varieties. A personal favorite (if you're wanting to deviate from the original), is to instead use Elderflower Tonic Water by Fever Tree. Either way, this is a classic and you can't go wrong, especially on a hot summer day.