Save your taste buds and your health and don't buy cottonseed oil. Skip the Pesach aisle and go to the baking aisle where you will find Hollywood Safflower oil Kof-K-P. You might also find grapeseed oil and olive oil that you can use.
I don't know if it is true, but I was always told that, aside from not being particularly healthy to begin with, cotton is not grown as a food crop and they tend to use more pesticides. If you are not buying organic, the difference may be negligible anyway since regular food crops also use tons of pesticides. In any case, those other oils are better, imho.