We drink a lot of water and I don't like to drink chlorine (taste) or buy disposable plastic if I can help it, so we brought a pur pitcher along with us so we could always drink from the room taps (and yes, we fly). It really didn't take up much room or weight at all in the luggage because we stuffed it full of clothes which also protected it from breaking. The pur filter creates decent tasting water. We would get ice and put it in the top, then put the sink/shower water over it, so the filtered water was also colder than we could have gotten from the fridge in the room. We didn't have to go out anywhere to find a place to fill our bottles (we have had trouble on cruises before) and didn't have to worry about contaminating the ship's water containers with our reusable bottles or hogging them by using one after the other ship cup, dump in, to fill 4 big reusable bottles. It was a solution that worked out really well for our family.