I found the Huggies Pure wipes were a bit gentler than the normal Huggies wipes - other than that when DS had really bad nappy rash I would get a zip lock bag and place nappy liners in it (kind of like chux wipes) and then wet them whilst out an about. I always have a bottle of water with me so if there isn't a tap to use warm water then I have my bottled water to use