Hhow to print 6 x 9 inch size double sided pages on 8.5 x 11 inch paper?

I am looking for instructions using Adobe Acrobat and free Adobe Reader on how to print 6 x 9 inch size double sided pages on 8.5 x 11 inch paper, so those without 6 x 9 paper can print and cut the pages to 6 x 9 inches.