Yep - never mix even the smallest drop of water or water-based liquid with almond bark! One of those things I know but didn't realize until recently that most people don't!
Another option is candy melts. When I make may of my confections that's what I use. You can get them at Joann's or Michaels (Walmart has only white or brown color choices). They taste just like and act just like almond bark but are already colored. There is red, yellow, light blue, dark blue, orange, pink, black, dark brown, light brown etc.....SO many choices!!