I would transfer the contents to a glass bottle that has a cap that seals tightly such as Schweppes 10 fl oz bottles from the grocery store or GTS Kombucha 16 fl oz glass bottles. Both have excellent caps.
I hope your CDS was cold when you opened it and you were able to seal it right away. Otherwise you may have lost some of the CLO2 gas. If you smell CLO2 gas you know some has escaped the bottle.
Can you post a link to where you bought the CDS so I can take a look at the bottle and cap? Thanks.
I keep a 1 fl oz bottle of CDS in my bathroom for teeth brushing. The bottle is not kept cold, but that small amount of CDS still works after a week or so. A glass eye dropper is used to take out a small amount of CDS which is mixed into some water in a glass shot glass. I then dip my tooth brush into that shot glass.