Generally the plastic is ok unless it gets hot.
Look on the bottom of the bottle in the little triangle their is a number.
#1- polyethylene terephthalate (PET)
soda & water containers, some waterproof packaging, tennis balls.
#2 - high-density polyethylene (PE)
milk, detergent & oil bottles. toys and plastic bags.
#3 - vinyl / polyvinyl chloride (PVC)
food wrap, vegetable oil bottles, blister packages.
#4 - low-density polyethylene
many plastic bags. shrink wrap, garment bags.
#5 - polypropylene
refrigerated containers, some bags, most bottle tops,
some carpets, some food wrap, chairs (back/seats).
#6 - polystyrene
throwaway utensils, meat packing, protective packing.
#7 - other. usually layered or mixed plastic.
no recycling potential - must be landfilled.