tonic water
US /ˈtɑː.nɪk ˌwɑː.tər/
UK /ˈtɑː.nɪk ˌwɑː.tər/

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