Free: Contests & Raffles.
Bring crystal light or Mio to make it taste a bit better once it's filtered at least.
You'll never get that taste out of it...trust me. Then your filter is nasty too.
Crapping water ? We always called it Pissing out your a--. Been there, and it's not fun. Will totally ruin you and your week's worth of undie's and any scent control is out the window. My Grand father always said, If you see this plant in the water, It will be safe to drink. Never trust your grand father. Remember, It was him that told you to pull his finger
Just pick up an inexpensive filter and pre-filter with some type of strainer or coffee filters. The Sawyer or newer Katadyn Be Free work awesome and cheaper than a tank of gas.
If its as bad as you say it is, I would do some pre-scouting and haul in 3 gallons of water each time and stash it for season. 1 gallon of water weighs roughly 8.5 lbs. Do some training and get a stash going. Depending on how many people and how long youll be there 6 gallons of water can go a long way.
The best filter for nasty water would be a Berkey System. It is a drip system that is slow but will filter very nasty water and make it safe to drink and taste fine. They come as small as .95 liters and 1.5 gallons. They may be larger and heavier than a traditional backpack filter but do a much better job and provide safe water. Luke