AmazonCommercial 2-Ply White Ultra Plus Individually Wrapped Toilet Paper Tissue, Bulk, Septic Safe,FSC Certified,Unscented, 32000 Count, 80 Pack of 400 Sheets per Roll (4.1″ x 3.5″ Sheet).  I’ve seen this being purchased by various food pantries around the country (thanks, YouTube!) and it’s supposed to be comparable to Charmin (probably made by them, since they’re the largest mfr/seller in the marketplace.  Amazon reviews are excellent.