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

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/