Cespenar also said that you created him 'again'. He doesn't really seem to bother too much about being destroyed, and I woulnd't really worry it. It's worse for the NPCs you may have called to the pocket plane and ordered to wait
Anyway, I noticed the bottle too, but I've no idea where to legally get it. It's not really nessecary either, as you can go to the pocket plane at almost any time, and before the final fight you have plenty of oppertunity to finish your weaponry. You won't find much after.