Glad to know that you're both enjoying your stay in the Philippines. Siargao seems to be the top destination here nowadays.
As for vegan wine, coconuts, sugarcane and some fruits are being fermented that become juice, beer and then wine. Depending on the duration one has been fermented.
So far, ive only seen 1 vegan community in Negros Oriental.
Enjoy your stay in the Philippines!
RE: First Impressions & Eating Vegan in the Philippines (not easy, but not impossible!)