Take a dental pick and pick the plastic underliner out of the cap ( if it's a soft drink).
Then use lineman's pliers to sorta bring the crimped edges "up flat".
Then take two pieces of any kind of metal flat bar bigger than the bottle cap. Next, put the "fuzzy" side of velcro on either side of the flat bar.
Then put the flat bars (with the bottle caps inside) into a bench vise. keep re-arranging the bottle caps unit they are flat.
Next, to curve, take two pieces of PVC filled with concrete, just larger than the bend you want to make and roll the bottle caps between the two pipes.
This will make a perfect bottle cap bend.