The best replacement for gin and tonic is vodka tonic.

The best alternatives to gin and tonic are rated as following:
★★★★★  vodka tonic
★★★★  gin and soda
★★★★  gin and club soda
★★★  rum and coke
★★★  gin rickey
★★  gimlet
★★  martini
★★  tom collins
★  vodka soda
★  wine calories
  vodka and tonic

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Speaking about gin and tonic, one probably shouldn't forget about bitters.

Other search terms related to gin and tonic and their ratings are:
★★★★★ bitters
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Google Trends

Scale is based on the average worldwide traffic of gin and tonic in all years. Click on graph for more.
gin and tonic
vodka tonic
gin and soda