We had this when we had our kitchen extension built last year. We went straight back by 3m.
The dishwasher remained in situ which became the middle of the room, still plumbed in even after they took the old external wall down. The electric socket was hanging down from the ceiling and we duct taped it to the acro-prop holding up the wall above, and the old sink unit was left in place too until the last minute.
When we lost the drain for the dishwasher we just used a massive plastic samla tub from Ikea to drain it into! So we used duct tape to attach the pipe to the tub and emptied the tub every morning.
They then re-routed the cold water feed which was a pipe in the middle of the room, so it needed moving to the new external wall. And again we just moved the dishwasher, the plumber put a washing machine hose flexi pipe thing onto the new cold water feed, it meant the plasterer could get his water from there, and of course we could use it to still feed that dishwasher!! 
When the kitchen was to be fitted we clearly had to lose the dishwasher at that stage so we went onto paper plates. I was making lots of cups of tea for the builders and to be honest I couldn't be bothered to wash up more stuff so good quality paper plates and plastic cutlery, all went in the bin. Felt very picnic like.
As we were putting in an induction hob, we bought the Andrew James 2 ring induction hob (have since used it to cook outside) and set up a temporary kitchen in the boy's playroom. We had a microwave, moved the fridge freezer into there and the induction hob plus the usual kettle and toaster.
To be quite honest, it was a very stress free build. My one piece of advice is when the kitchen is finished, and you have cleaned it, leave it a day and clean it again as that buidlers/joiner's dust does get everywhere. And even after you have cleaned it leaves a film of dust again.