Neps to bloom? They bloom when they feel like it, and they dont bloom often at all.
Do you mean pitcher them?
Not sure what the best mix for Neps is, but add some orchid bark tot he soil if you are reppoting them.
Dont sit the Neps in water. It tends to kill them.
Pure peat is fine for the VFT and Cobra lily though I would add some sand to the mix aswell.
The pot size depends on plant size.