tonic water

US /ˈtɑː.nɪk ˌwɑː.tər/
UK /ˈtɑː.nɪk ˌwɑː.tər/
"tonic water" picture
1.

a carbonated drink containing quinine, often mixed with gin or vodka

:
I'll have a gin and tonic water, please.
She prefers to drink plain tonic water with a slice of lime.