Making Seltzer on Shabbat

Can I manually pump CO2 gas into water on shabbat in order to make soda water?

Some possible issues with this.
A. You change the water from water to seltzer water and it could be molid.
B. Making it is called עובדין דחול meaning its something done primarily on a weekday.
C. Screwing and unscrewing the gas to the bottle could be bone in kelim.
Lemaase its a big machloket and if one can do it before he should.
Chacham Ovadiah allowed it