Is it possible to send bitcoins without paying a fee?
Yes, but not over the blockchain. You'd need to physically give someone a device that holds Bitcoin.
OpenDime is perfect for these transactions. It's a device the size of a USB drive that you load with Bitcoin and then physically hand over to someone as payment for whatever reason payment is needed. The Bitcoin can be redeemed once and then the device is thrown away.
How many confirmations required to ensure a transaction is successful?
None, because this transaction would not go through the blockchain.
Is it possible to transfer without internet?
Yes, if you have bitcoin loaded on a physical device you can sell that device to anyone for any amount of money both parties agree upon.
These responses only apply to transactions made over the blockchain.
No it is not posible for you to send money without any fees.
No you need to pay fee to have a good transactions its like a delivery, if you want to deliver your money to the invoice, then you need to pay.
1.No, you are required to have fees so that miner can confirm your transaction.