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>But if it's possible to degrade it i solar-powered furnaces without any hazardous/toxic byproducts, it's already worth it.

Bottles don't carry themselves to solar-powered furnaces. If we assume that they did (and plastic oceans in the pacific demonstrate otherwise), then we could target the much-easier problem of making plastics that are stable when dumped in a landfill.

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I suppose the perfect bottle plastic would biodegrade under natural conditions after 5 years or so, but also biodegrade rapidly under enhanced conditions (e.g high temp, fungi).

That way the lifespan of the contents wouldn't be limited by the bottle - minimising food waste - but we'd retain the ability to get rid of the bottle safely without huge landfills.

So if I leave a bottle of water in summer inside a car, then will I be drinking plastic juice?

You already kinda do if you're drinking bottles of water left in the car for a long time, time+sun/heat/motion is how microplastics are made.

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