Any suggestions on caps for Bakers and Chefs plastic squeeze bottles?
The product you link has the cap in the picture.

The idea is that you cut off the tip on the apex of the cap to the point where it is the width of your desired opening.

You could use an uncut cap, or just cover the tip with foil if you need to refrigerate for some time.  The kind of things put into a squeeze bottles are rarely highly perishable, so simply placing them in refrigerator (for a reasonable period of time) is a normal practice.

Squeeze bottles are not meant for long term storage. I certainly would not go to the trouble of special ordering caps.