First and foremost, I appreciate the concern. It needs stating repeatedly that
having equipment that is appropriate for the task, and safe for the operator and end user is absolutely mission critical.
As stated, the cooler in question doesn’t hold water.
So no fear of filling it with solvent.
Pretty sure acetone will get you styrene 
(or at least liquid cooler)
Also pretty sure Everclear in a styrofoam coffee cup won’t do you any more harm than from a mason jar…but I wouldn’t take my word on that.
Both solvent & biomass are stored in nice shiny beer kegs. I’ve described the mods to those kegs around here somewhere. Including the recommendation that you don’t try fitting a 10" tri-clamp ferrule on there.
…because you have to cut the rolled edge of the keg to allow access to the bolts. That compromises the keg, and the ferrule ends up bending over time. making those ethanol resistant PTFE gaskets way harder to get a seal on.
…so I substituted the slightly less impervious viton.
Rather than the ethanol & hydrocarbon susceptible silicone.
transfer hoses are PTFE with stainless overbraid, or whatever elastomer Delta ships with their CUP. (I think I posted my best guess on that too).