In Rev 22:17, if the Spirit is God then who is the Bride? Since both are giving water of life, she should be God as well? ?

The acknowledged/betrothed bride of Jesus Christ is the Christian Church.

John 4:10-14 addresses this matter.

The Church is the Bride of Christ. A person can better know the true meanings of Bible verses by reciting the rosary every day with care and sincerity.

The members of the bride class​—the spirit-anointed Christians—​are the first to extend the invitation to “come.” To whom? Well, the bride is not saying, “Come!” to herself. Her words are directed to those who hope to gain everlasting life on earth after “the war of the great day of God the Almighty” has been fought.​—Read Revelation 16:14, 16.

The KJV is a translation of a translation of a bunch of superstitious rubbish passed down from the Bronze Age.  You would not expect it to make any sense. 

We are the bride

God has lived on earth as both male and female at different times. NOT JUST NAMED JESUS which is why Christians anger God for not accepting TRUTH. the bride is God on earth as female.

Rev 22:17 ¶ And the Spirit and the bride say, Come. And let him that heareth say, Come. And let him that is athirst come. And whosoever will, let him take the water of life freely.

The "bride" clearly represents the Christian church. 

"And the Spirit and the "church" say..."

The relation between Christ and his church is set forth under the figure of that between a bridegroom and bride ( John 3:29 ). The church is called "the bride" ( Revelation 21:9 ; 22:17 ). Compare parable of the Ten Virgins ( Matthew 25:1-13 ).

Eph 5:31 For this cause shall a man leave his father and mother, and shall be joined unto his wife, and they two shall be one flesh.

>>>>>>Eph 5:32 This is a great mystery: but I speak concerning Christ and the church.