WASHINGTON — First, the National Park Service said it would cut back on selling its visitors bottled water to reduce the litter left behind. Now, Congress – under pressure from the powerful bottled water industry – is threatening to cut off the federal money the Park Service is using to replace the disposable plastic water bottles with refilling stations. But even if that happens, the Park Service said this week it’ll keep encouraging the parks to halt their bottled water sales, even with an edict from Congress.