I don't know why everybody moans about the weather on Ben Nevis. Every time I've been up the behemoth the sun has been shining bright in the sky. First time was a perfect winters day with crystal clear blue skies. Views far and wide over the Highlands. The most recent was a few weeks ago. A Wednesday in late August with a bit of haze. With a temperature in the mid to high 20s. By the halfway lochan or to give it's correct name, Lochan Meall an t-Suidhe, (cut and pasted) I'd gone through 2 1/2 litres of water and one of my group the same. So it was time to test the Grayl Geopress

The Katadyn Hiker Pro is one of the most popular and best selling water filters in the world, combining efficiency and easy in-the-field maintenance with a quick connect system for a range of hydration bladders and bottles.

There are a couple of options for water whilst outdoors, you can either carry it with you or you take it from a local source like a stream.