Has anyone used a Brita Stainless Steel Filtering Water Bottle at a Disney park before? If so, did it significantly improve the taste of the free water at Disney parks? If you fill it up with ice before you go, how long did the ice last? Can you put packet of liquid IV or Gatorade in it or are you not supposed to do that since it will come through the filter? Its going to be very hot when we go to Orlando in a few weeks so I'm trying to decide if I'm going to buy a 20 ounce Brita Stainless Steel Filtering Water bottle or save $5 and just buy a regular Stainless Steel water bottle instead.