There's a good outdoors shop here too, if you're heading up Goatfell.
You can get the water filter at your local outdoors shop.
There is also a large car park, an information centre, several outdoors shops and a youth hostel.
Standing at the northern end of Lake Windermere and backed by an impressive panorama of grey-green fells, the small town of Ambleside is a bustling hub for the region's hikers and trekkers, with more outdoors shops per square foot than almost anywhere else in the Lakes.
This impressive outdoors shop offers practically everything you'd need for anything from a hike up Table Mountain to a Cape-to-Cairo safari.
Your local outdoors shop can advise you.