I am refilling their hay rack a few times a day. I am still using the bag of All Living Things brand timothy hay that I bought when they were new. I had not yet researched hay brands at that point when I brought it, but I think it is decent hay. It smells sweet when I open the bag, and it looks very comparable to the Oxbow 2nd cut hay (from what I can tell looking through the bag at the Oxbow hay at the pet store). I may try Oxbow next, although there were a lot of reviews on Chewy and Amazon that said the quality has gone downhill recently (maybe it's a seasonal issue).
They have not been to the vet yet. I will take them at some point, but they do seem healthy so far, and they are drinking plenty of water now too. Now if I could only get them to eat pellets! I think they might be eating a very few of them, but it should be more. Might just have to break down and buy them a different kind.
I have noticed in the 2.5 weeks since I brought them home from the animal shelter, they have gradually grown a little more open to trying new things. For example, at first they wouldn't eat any veggies that weren't greens, and they would even sort out some of those, like they wouldn't eat the arugula in the spring mix I fed them. Now they are eating a variety of things in addition to their hay and pellets. They have such funny little personalities, so cute!