Whilst travelling through Mexico and Guatemala the Water-to-Go filtration system never let us down. Whether drinking the tap water in Mexico City or a filling up from a stream, whilst hiking in the Mountains of Oaxaca and Lake Atitlan, our Water-to-Go bottles provided us with clean and fresh drinking water. Recommending the system to people as we travelled we carry on to do so whilst working with groups in the Scottish Highlands and when out playing in the outdoors with friends. A simple but effective design! Highly recommended!