Safe epoxy or glue?

[originalozzyo]

Can anyone recommend a safe type of epoxy or some kind of glue for doing aquascaping? I don't want to go and buy the two part epoxy from the lfs since i have had bad experiences with them as far as holding large rocks together and they aren't cheap for how much you get and the amount needed to support anything large. I am considering using plastic zip ties or maybe superglue. Thanks.