Venus has very little water, so a starting point would be to launch large solar-powered balloons that just float around and collect water by cracking the sulfuric acid in the clouds. Living systems also require a lot of trace minerals that would have to be harvested from the surface. I think it could all be done, but probably not for a price that anyone is willing to pay.
At 50km where the temperature and pressure are nearly Earthlike you've got about 25 ppm of water. Which is rather dry but not so much that it would be unprecedented on Earth. The concentration of sulfuric acid is around half that so it makes more sense to extract the water directly like so:
"While Venus’s surface is awful, its upper atmosphere is surprisingly Earthlike. 55 kilometers up, a human could survive with an oxygen mask and a protective wetsuit; the air is room temperature and the pressure is similar to that on Earth mountains. You need the wetsuit, though, to protect you from the sulfuric acid."
Maybe if your plants can deal with the acid you might be able to do it. (I am not a biologist, chemist or anything relevant to answer this question, this is just my best guess).