If you want a blank canvas for cocktails, pick seltzer. It’s cheap, neutral, and won’t fight your vodka. Grocery store brand? Perfect. You are a budget artist.
If you want a subtle, mineral taste (and look fancy), pick sparkling mineral water. Pour it in a wine glass. Pretend you are in a French café. Your cat won’t know the difference. You will feel classy.
If you want sodium for some reason, grab club soda. It’s like ocean water, but less salty and more polite. Bartenders love it. It holds its fizz longer. Party trick knowledge: club soda’s salt makes it better for mixing than seltzer.