Lomond Mountain Rescue have issued a warning regarding water consumption on the WHW.
Guidance in the first instance water should be obtained from known sources e.g. the Scottish Water fountains, taps marked or known to be drinking water or bottled water (please consider the environmental impact of this one). If water is collected from a stream, it should be treated prior to consumption.
Please bear in mind that filtering alone may not guarantee safety and we would recommend secondary treatment such as boiling or chemical treatment. This is especially suggested in areas where livestock / run off may be an issue e.g. on the approach to Conic Hill.
Further guidance can be found in the link below.