Emergency Water Supplies. Brecon Carreg mineral water comes from a pure and untouched source in the Brecon Beacons National Park. It has a balanced mineral content and its low sodium content (only 5.0mg per litre) makes it suitable for a low sodium diet. So not only is it a thirst-quenching drink, it’s perfectly healthy too. All bottles are 100% recyclable including the label and lids. Ideal for the treatment of burns when clean tap water is not to hand.