Do you recognise this book, the title or author?

Question

It's set in the past about a group of people who drink this water of immortality, this guy wants to market the water and use them to prove it works. He wants to kill them in different ways in front of audiences so they'll come back to life. He threatens to shoot this little girl who loves the youngest immortal and they give her the water to drink when she's older. But she gives some to this frog who's being chased (yeah I know it's weird) and I can't remember any further. I REALLY need to know what it's called so on the small chance you've heard of it or read it please let me know. Thank you :)

Answer 1

"Tuck Everlasting" by Natalie Babbitt
http://www.amazon.com/gp/product/product-description/0312369816/ref=dp_proddesc_0/104-8412583-2845536?ie=UTF8&n=283155&s=books
"
When ten-year-old Winnie Foster stumbles upon the Tuck family's disturbing secret, she is forced to come to terms with her conflicting emotions. She feels drawn to the loving, gentle and rather eccentric Tucks, but what they tell her is too incredible to be believed. Doomed to?or blessed with?eternal life after drinking from a magic spring, the Tuck family tries to make Winnie understand that the terrible magic of the forest spring can never be revealed. The consequences to the world could prove to be disastrous!

But then an unexpected complication arises when Winnie is followed by a stranger who wants to sell the spring water and make a fortune."

Answer 2

That looks like tuck everlasting by natalie babbitt.

The Tuck family is confronted with an agonizing situation when they discover that a ten-year-old girl and a malicious stranger now share their secret about a spring whose water prevents one from ever growing any older.

Answer 3

Will a google search help you? I haven't tried myself and so can't be certain.