The obvious solution is tonic water to generate a G&T. Keep in mind, when you are drinking an excellent gin, Really don't spoil it with cheap tonic! There are several tonics on the market - with Strange and great flavours to test. My recommendation is to keep it very simple https://spencermzntq.thezenweb.com/blending-water-for-gin-things-to-know-before-you-buy-66014735