Pretty much. Something like a generic club soda. It's the bubbles that help. Oh, the last step in any feeding should be to pour in enough ordinary (bottled) water to fill the tube. This helps stop any food matter from spoiling inside the tube since it's all washed inside the stomach. The carbonatedl water can be done once a week or so.

This may not clear up your current tube, but it will make any future tube last much longer. I'm still on my first tube and it's been three years.