He said "Take me some water, please..."

The sentence “take me some water please” is used to give an instruction or command. Giving instruction is an expression that Is used in other that order person does what we instruct or request. When the commanding word is a verb , you use the invinitive without to.
Examples:
1. Read the sentences!
2. Wash your hand!
3. Take the bottle!, etc.
If you do not use a verb as a commanding word, you use “be + adjective”. Examples:
1. Be yourself.
2. Be better.
3. Be strong.

 

"Hey, don't give him the ball!

The sentences “hey, don’t give him the ball.” Is used to express a prohibition or to forbit someone to do something. When you forbid someone to do something, you use Don’t + Verb infinitive without to.
Examples:
1. Don’t run!
2. Don’t be afraid!
3. Don’t forget me!
You often put the word ‘please’ at the beginning or at the end of an instruction. You use it to make the instruction sounds more polite.
Example:
1. Please silent/silent please.
2. Please come back/come back please.