I use high quality artists acid free watercolour paper. My favourites are Langton, Arches and Bockingford.
Paper weight ranges from 140 lb. to 250 lb. either NOT (not hot pressed) or rough.
I use Winsor and Newton Artists watercolours i.e. "the world's finest watercolours" with the highest possible permanence. I generally use pans of watercolour.
Oil and acrylic paintings are on stretched deep canvas without frame and painted around the edges, or on canvas board and framed. I use artist quality oil paints.