I add just enough water to make it stick together. I put it in the commercial plastic trays that I have saved and store in the freezer until I am ready to use it. Have fun, and enjoy the birds. There have been cases of birds found dead with pure peanut butter in their mouths. Speculation has been that the pure peanut butter is too dry on its own.
Some people like to include seeds also.
Jill Noblesville another man says no deaths. Indbio Dear Friends, I have never had Ruby Crowned Kinglets before coming to my feeders until recently. I bought all of these at a store specializing in pet birds. I am thinking of trying other seeds to see what else will come to my feeders. I'd be interested to know if anyone else uses something special in their feeders.