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Naglene bottles nowadays are made of a type of polycarbonate called “Tritan”, it does not have BPA but has BPS instead, which also leaches in reaction to heat and acid. Tritan is also more fragile than polycarbonate, as in the past I have used the “BPA -free” gallon water bottles and after some time they broke. Cooking or heating any food or drink with plastic is generally a bad idea, even if it’s BPA free.
Be careful with insulation foam, it’s loaded with things like flame retardants and mold inhibitors.
Just a heads up, essential oils can degrade certain plastics (which us why they are always in glass bottles). Polymer clay is plastic-based, typically polyvinyl chloride.