I just got a puppy and what age can I have she be dip flea medication . She is 6 weeks old

I don't recommend dips at ay age. The modern products such as Revolution, Advantage, Contact, Program, etc. are more effective. Some of them are safe to start at 6 weeks. Ask your vet. If the puppy already has fleas, some of the flea sprays are safe, or at least spray a towel and wrap the puppy in it. You may also need to treat your house and yard. Flea infestations are hard to clear up.

Can I feed my puppy evaporated milk . I don't have milk that puppy drink I need to go to store in am

No, it contains lactose which the puppy can't digest. Feed it some chicken and rice as below if you have it. Get it on a commercial puppy chow as soon as you can.

If a dog is having trouble keeping anything down or continuing diarrhea try this out of the manual I have from a large, knowledgeable dog guide school.

Bland recovery diet for dogs.

3 parts cooked rice, one part boiled hamburger or chicken, or cottage cheese. I think you can substitute boiled potatoes for the rice. Once in an emergency, we bought a plain baked potato from Wendy's.

This is meant for short time settling a dog's digestive tract. It is not the complete and balanced diet they need long term. I have seen it work.

Also, see the sticky at https://www.askmehelpdesk.com/dogs/information-articles-our-dogs-expert-labman-53153.html#post251802