a lot of cities/towns/countries have already banned plastic bags.
we usually end up with a LOT of water bottles and jugs. we try and refill when possible. when we leave, i just hate tossing them out, but no one would take them.
i never thought of it before, but one could take some nesting plastic containers & lids to the vendors and ask them to put the to-go food into them instead of the styrofoam & plastic. awkward for tourists, but maybe ok for residents. i might just do that next time we go.