I am stopping at a friends house for a few days while she visits her daughter in Hospital. I have my dogs with me and I am looking after her dogs. The dogs are being kept separate as they don't know each other well enough to integrate them. Problem is her dogs are noisy which is bad enough but mine especially my foster are barking incessantly at every tiny noise. It is driving me nuts and I have another week of this. I can't throw biscuits around as they would be eating constantly and would be the size of a house in no time. I have been losing it ans screaming at them which is obviously not a good idea although it seems to shut them up for  a few minutes until the next sound. Can anyone help with a kind and effective way to keep them all quiet before I go out of my mind?
Putting one or other set of dogs in kennels is not an option unfortunately. My dogs are not just barking at her dogs but at every strange noise they hear. The neighbours will be compplaining soon. :(

This sounds like the impossible dream to me...in your current situation with your new rescue it sounds like the worst scenario for him.He needs stability ,a familiar routine and calm and isn't going to get it in this situation.The time factor is against you too...how much can you achieve in just a few days..the other dogs will view yours as interlopers. Your own dogs are going to be in upheaval too... Sorry to sound so negative,but what have you taken on?
I admire your optimism to take this on for your friend but you sound like its already too much and definitely not working. In the meantime
Id get some ear plugs  and be prepared to walk your own dogs to get them tired out.Maybe  get a friend in to help throw a ball for the  other dogs and help you keep your sanity...what a nightmare!Stiff drinks all round!

Lots of walks and chews that take a while to demolish, and try your best to keep calm and quiet yourself.  I know how hard it is - yesterday I sent a foster off to a new home who's been here for a fortnight, she couldn't go in with my own dogs at all and my collie was barking every time I so much as touched the kitchen door for a while, and if I got away with that, she was barking once I'd shut it having gone in with the foster, and again when I touched the back door from inside the kitchen... it's just been a nightmare and yes, I've lost my cool with her numerous times and ended up shouting.  It simply does not work - it stops her at the time but then she starts again soon after, because my shouting hasn't made any difference to her reaction to the trigger itself.  What does work is me setting things up so I can clicker train calm behaviour around me opening/touching doors, and also managing things if I can to reduce it (e.g. she barks MUCH more if she's upstairs at the time but if she's in the hallway looking, will bark much less and I have a much better chance of keeping her calm and stopping it happening).

Problem with your situation as Bellamia has already said is that it's totally new and stressful for your dogs - they will naturally be more reactive.  Distraction is going to be your best bet with the noises I think, if you can't pin down specifics (so you could do a quick bit of this noise = yummy treat with them) - train a positive interrupter so you can distract them easily, it only takes a minute to do, then you can just make a noise quickly and it'll take their mind off whatever they're barking at.  I'd do the same with your friend's dogs too, so that if you interrupt yours, then the others aren't going to set them off again.  Vid here for that:

https://www.youtube.com/watch?v=TBvPaqMZyo8

Hi New York...did you survive? how are things working out?  I was thinking of you yesterday on my walk...I hope you've had a better couple of days.You must be a great friend to do this for your mate,she is lucky to have you!