Margaret,
no skills required here.
Just dissolve the salt and soda in the water and you are ready.
The composition is variable and depending on taste (salty) you can reduce the amount of salt. Strangely enough this concotion has never "burned" me even during the times when water was.

(I just put the stuff (1 level Tablespoon each) in an empty soda bottle, put some water in shake and then fill). To be honest I do not measure the amounts accurately.
One thing get the unscented soda! Not the one they want you to use for the kitty litter


M