Substrate & Hide advice, please - Safe Choices?

I am shopping around for substrate and hides for my B. smithi. The guy at the pet store made a recommendation for the substrate, but I'm so paranoid about buying the wrong thing. Here's what he recommended: Bed-A-Beast Litter. I was trying to find some sort of small amount to buy, so this seemed a viable option. I hate that a lot of these things don't tell you the ingredients, though! Today I shopped around the store and also found T-Rex Jungle Bed which looks a lot like what I've got (from the breeder). I know the breeder mixes two things to make his substrate, but I can't recall at the moment what those two things are.

As for the hide... I couldn't find anything small enough for the cage, so I was considering cutting a toilet paper (unscented) roll down and give that to her. Is this safe? I've seen where people use film canisters, but I think she needs something slightly larger. She has never had a hide before, but she doesn't really burrow - she just gets a little dent in the dirt or smooshes as close to a wall as possible. I think she would like a hide.

Thanks for any advice you guys can offer!