Which button on this soda fountain gives me plain soda water?

How to say “Which button on this soda fountain gives me plain soda water?” in Japanese

In Japanese

このドリンクサーバー、ただの炭酸水(たんさんすい)を出(だ)すにはどのボタンを押(お)せばいい？

Kono dorinku sābā, tada no tansansui o dasu ni wa dono botan o oseba ii?

Which button on this soda fountain gives me plain soda water? in other languages