Don’t aluminum cans have a synthetic plastic lining inside?
Yes, they do; it’s an epoxy lining, and its exact makeup varies according to whatever food is being contained within it. The epoxies that contain soft drinks, for example, are different from the ones that contain chicken, or fish, or tomato sauce. I’m unsure of what epoxy is used to contain water, although it seems logical that there would certainly be an epoxy lining present.