Plastic is porous and would retain some of the bleach, so I don't know if a bleach bottle is a good thing to be used for a birdhouse, or anything else. I personally would not reuse a bleach bottle due to the toxicity of bleach. Just my 2 1/2 cents!
Try the Pack-0-Fun website at www.packofun.com or Google it. I would think that the best way to add stones and mortar would be airdry gray clay and regular stones. Prepare the outside of the house by sanding in all directions so there will be a tooth for the clay. Glue stones on in a pleasing pattern with hot glue leaving spaces between. Knead the clay until soft and just fill in the cracks or try window putty for something that would probably do better outside.
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