Bothies can be very hit and miss traffic wise.
Water front, i tend to boil. My inline filter will sort out high level water. If unsure i have to use puritabs in the bag, and the Aquamira should filter out the chemical taste.
Sawyer filters have dropped in price and worth looking into, my Aquamira was 1/2 the price and size of a Sawyer when i got it. I would go Sawyer next, or intergrated water bottler filter.
You might score lucky and get it to yourself......you might have people stumble in at midnight, wake you up, then cook them selves a meal.
I tend to pitch up nearby, and just vist the bothy.
The rule is never too turn anyone away, so it can get cramped in some, or you can use one as a base for 2-3 days and never see anyone else which would be bliss.
My last encounter was at sourlies, we never made it too the bothy for the night, but could look down on it from the mountain we got stuck on. I could see 2 people in yellow coats and a couple of dogs.
We got down there at 8.30am, i almost fell through the door after fording the swollen burn... this very striking blonde lady from Finland offered me a whisky....then Mrs Ace followed me in, i noticed Mr Finland and the instant fantasy died, but they had excess boiled water, would we like it, so instant hot drink after falling through the door
The couple we met where not the couple with dogs i had seen from the mountain, they left very early in the morning.
We sorted ourselves out, boiled off some water, repacked the rucksacks and set off for Inverie, as we left 2 canoes beached and became the current guardians of the bothy as we waved goodbye.
Inside you will find a log book, you can get some info on conditions in and out of the bothy area and the amount of traffic passing through. You may find part used gas cans, lighters, matches, cup-a-soups and instant hot drinks. If you have spares, maybe leave a little something, if your desperate maybe grab something. It was obvious that the RAF had been at Camoursaury bothy on Skye and left a stack of glowsticks, i swiped some glowsticks and left MOD drinks and packs of matches in return.
Don't just drop crap, think more along the lines of..... i am heading out, back to civilisation, i don't need these bit's and pieces, it might be a life saver to someone that gets caught in bad weather (matches/half 3/4 used gas can and cup-a-soups) found loads of booze in one, part bottles of scotch, southern comfort, Gordons, Jack etc etc, excellent for getting smashed or emergency fire lighting.
You find some odd things in bothys
Bothy culture is ace, weekends will be busy with munro baggers, weekdays quiter. The people you meet will be outdoorisy types, the more remote the bothy the more hardcore the bothists
Check around for the mountain bothy association website, that will update on any closures or work teams.
Bothy near Ben Alder "Culra" is closed due to wear and tear and asbestos nature of the stucture, but that's a pretty remote one, but it appears to be well used.