I was trying to make Manapla-style puto which I was told years ago has wild yeast or rice yeast as leavening agent. I looked online for white rice yeast, found this website about Philippine rice wine called tapuy and several other blogs on how to make rice wine at home, then quickly abandoned the puto. White rice yeast from the Philippines is impossible to get here in the US but I was able to buy from our local Asian store a packet of Chinese red rice wine yeast. I used this yeast and a cup of black glutinous rice and followed the recipe from the Filipino website.