Does your pet store carry any other kinds of driftwood? Most fish stores should have pre-treated driftwood for fish aquariums that you can just soak for a day or so and then pop in.
gl!
Java fern, bacopa, and milfoil (foxtail) are all pretty hardy plants, just make sure if you go with java fern not to bury its roots- you want to use a rubber band or thread to gently attach it to driftwood or something similar, and then after a while it will take hold on it's own and you can remove the string.
gl!
