Most plastic is not consumer but business use. As much as you think your veggies wrapped in plastic is bad, everything in the supply chain leading to your veggies was wrapped in plastic: the pallet they came on, every part that went into making the truck that shipped it (multiple times, as the truck in various states of manufacture made its way around several different geographically dispersed factories), the soil an…
The thing is, bottled water is convenient as shit, I religiously use a insulated water bottle to avoid this type of waste, and I suspect a lot of people do.
So I don't think reducing personal consumption is insignificant, although I agree with you.