The best replacement for soda water is tonic water.

The best alternatives to soda water are rated as following:
★★★★★  tonic water
★★★★★  club soda
★★★  tonic
★★★  seltzer
★★  sparkling water
★★  seltzer water
★  mineral water
★  carbonated water
  pellegrino
  sparkling mineral
  sparkling mineral water
  sparkling

Your alternative for soda water is not listed? Suggest!
Speaking about soda water, one probably shouldn't forget about espresso.

Other search terms related to soda water and their ratings are:
★★★★★ espresso
★ batter
You have in mind a companion for soda water and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of soda water in all years. Click on graph for more.
soda water
tonic water
club soda