A tiny bit of water shouldn't hurt the juice, heck, some are made with water in them. But, yeah, some bottles are just cheaper than heck and might not be happy in hot water. I don't steep many of my juices anyways as I try them in a dripper first, and if I like, I just vape it.
There is one I HAVE to steep, a vanilla custard which is always fresh when I get it and after five days in a dark place and mix it once a day....is awesome!