Invest in a bucket

A shiny dump bucket.

Shiny or not, let's hope they don't give a shit.

In England, the water companies aren't allow to cut off your water even if you don't pay. Some health and safety issues, I think!!!

This reminds me of a scene in Dumb and Dumber..

Mary: I hope you're not using the toilet; it doesn't flush.
Harry: uhh no.... I'm just... shaving!

haha funny scene.

Use the garden

You could just tell everyone that the water is temporarily cut off and leave a sign in the bathrooms or something like that!

There's many effective ways to fix this:
1. Find a new place to host the party and tell everyone to go there instead.
2. Uninvited everyone, explaining that your water is cut off due to a burst pipe or something else less embarrassing...
3. Tell everyone that they're still invited but let them know that the water is cut off with the same excuse as 2.

Come on OP, could have been worse.

Or hire a port-a-loo...

Change of venue to any of your best friends home OP?

"I'm holding a party! Everyone go to Rob's house!" ...Seems like a really asshole like thing to do to me.

It's not an asshole move. If my friend was in a similar position I would offer. What's a friend for if they're not there when you need them. Obviously you would ask them alone first though.

The joke was centered around the fact that no one offered. I would also offer in that position, but 4 simply said to hold it at someone else's house, not to ask to.

common sense here people! i am sure he meant to ask

That was the joke, 40.

24 - How can anyone offer when they don't yet know there is a problem ;)

Just tell them you're having plumbing issues and to not go

Oh wow, that's a shitty deal... =

Cmon man... I know you can make a better pun than that.

The FML user uses "Bad Pun"

It is not very effective.

Did you read what you typed, there? You proud of that?

Don't disinvite them.

Just simply put a "Sorry for the inconvenience" sign on your bathroom doors.

But realistically they need to offer another option. Whether they go and buy 15-20 gallon jugs so they can fill the toilets manually after each flush or get a porta-potty or something. Can't expect people to come over for a party and tell them they can't use a bathroom while they're there.

Tell them the bathroom is temporarily out of order. Maybe one of your neighbors will be kind enough to let people use theirs.

Do you have a friend or family member that might let you have the party at their house? If you assure them you'll clean up afterwards they might let you.

It seems unfair for your parents to not pay the water bill, assuming they knew about your party but I don't know anything about your family's financial situation so all I can say is sorry about your dilemma!