Answer:
A prehistoric reptile that lives today and the inspiration for the name of a popular sports drink.
What can you hold in your left hand but can never hold in your right hand?
Used to keep prisoners silent and to make temporary repairs on cars.
What travels from coast to coast without ever moving?
What can be any size or shape and gets bigger the more you take from it?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.