Have I read this correctly,your thinking of spraying an 8 week old puppy with water Why ?

He's a baby for gods sake,you need to train him,using the ignore bad behaviour and praise and reward the good,at 8 weeks old he won't understand anything yet!
It's takes time and patience to train pups not a quick fix solution like spraying with water,if I was his breeder I would be horrified that a new owner was even thinking about such a thing at such a young age.