Hmm... since #3 is PVC, I doubt you would ferment in that. Even if you found a PVC container, me thinks it'd scratch easily.
Here's the breakdown: (Bettle Bottles are PET, or #1, for reference.)
#1 - PET or polyethylene terephtalate, used for water bottles, etc. 'generally safe', but still has a porous surface
#2 - HDPE, a higher density polyethylene. used for milk jugs, etc.
#3 - PVC, as mentioned
#4 - LDPE, low density polyethylene, used for grocery bags and the like
#5 - polypropylene, can also be used in food applications. used as straws, yogurt cups, etc
#6 - Styrofoam, enough said
#7 - The 'IDK what to call this thing' category.
So basically, #2 and #5, but #1 is also acceptable as long as you are sure to keep it clean! (Which I'm sure you do.)