Where can I buy pure honey in Manila and how can I be sure that it is really pure?

I don't know any from Metro Manila. But Ilog Maria Honeybee Farms in Silang (so close to Tagaytay and Manila), a trusted name in supplying pure honey and other honey by-products, sells online. You can refer to their page here: https://www.facebook.com/pages/Ilog-Maria-Honey-Bee-Farms-Tagaytay/258143670876152?fref=ts My family and I regularly visit Ilog Maria Farm in Silang, Cavite. Aside from their pure honey that me and hubby love, bee propolis is also our favorite. Its an energy booster for us.

There are pure honey products in S&R and I think just to be sure, buy from credible stores. If it's sold in tingi tingi, you can't really trust its purity. You may refer to this link for your concern: http://www.mybeeline.co/beekeeping/how-can-we-differentiate-100-pure-honey-and-adulterated-honey/