A product called Bitter Apple, it comes in a water based and an oil based form. I prefer the water based.
As for the prevention of chewing, this is about access. You brought a puppy home. Everyone knows puppies explore with their mouths and this early chewing is TOTALLY normal and I suggest you work hard on it before you get to the adolescent chewing, which will be FAR more destructive that goes from about 6-18 months old.
Anything your puppy can chew should be removed, protected or made inaccessible. There should be at least a half dozen cool toys in EVERY room that the pup is encouraged to play with - actively. You actively playing with your pup with it’s toys will help it learn what is ok to play with and chew. There will be mistakes, this is your fault and your problem, not the puppies.
I’m happy to say I had very little inappropriate chewing with both my dogs when they were puppies. They always had MANY toys scattered around which we actively played with daily. If one of them picked up...say a sock...I’d take it away saying firmly “NOT A TOY”, immediately grab the nearest toy and rub their jaws with it “THIS IS A TOY!!!” In a playful voice and play with them with the toy for a bit.
There were a few casualties, including my blood pressure cuff, which I should not have left where the pup could reach it and about 12 inches of my bedtime hair braid (the joy of sleeping with puppies) but always my fault and my responsibility as the human in charge.
I’m seeing other people answer about crates and want to chime in on that. Crating has been linked to mental health issues in dogs. Crating for any period of time over about 2 hours is cruel. Dogs are intelligent, social, active animals and crating is ... bad for their brains. This will all be studied and scientific reports will come out some day that crating is (gasp) really bad for dogs but for now it’s a training “fad” that hasn’t run it’s course yet. 20 years ago crating wasn’t even a thing. I know people right now who crate their dogs all night and then again all day while they are at work. TOTALLY inappropriate, please find a way to keep a dog without locking it in a tiny box all day.