Lovely big healthy chicks
Personally i would not use any sawdust/shavings, leave the floor bare, easier for them to get the crumbs then. Grind the crumbs small if you think they need it, and the water thing as Millet said, i have had them drown in a thimble full!
I use the non slip stuff you can buy for under table cloths/ornaments for the floor and make bolster cushions from rolled up tea towels if you get any back flippers.
Check their bums daily, depending upon the food you might find their bums get dirty and block...due to the way they squat to poo
Cant wait to see what colours you g