I don't feed any of my Tillandsias. So many leaves fall into them I figure they get nutrients from those. I think Elaine does, maybe she'll pop in.
I don't soak them either since they are all outdoors and get lots of rain. I pour rain barrel water over them if it's been awhile since any rain and they seem dry, but most of mine are native.
We have been getting really cold here, I had to bring my hybrid tillies in the FL room, was 38F here this morn. This weekend they say more upper 30's, hope this is the last of it, at least not in the upper 20's like last year.