Sometimes you just have to
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Sometimes you just have to jump in and find out. Use the general principles of fusing and adapt them to the bottles. Normally bottle glass behaves in a similar way to float glass – very stiff, very prone to devitrification.
Your concern about damage to your kiln from using the bottles is misplaced as long as the bottles are clean and dry. There are several discussion lists where bottle slumping has been talked about. If you do an internet search I am sure you will come across them.
Experimentation is about knowing the principles of what you want to do and apply them to the specific materials. glass is coloured with a few minerals, none of which are dangerous to you or your kiln.