Any big enough body of water will do.
Water baptism cannot get you into heaven, water baptism is not required to get into heaven, and water baptism cannot be added to what gets you into heaven (1 Corinthians 1:17). No works can be added to what gets you into heaven (Romans 4:5).
What gets you into heaven, is believing in Jesus. That easy.
And then you can get water baptized as a testimony that you died to unbeilef, and are raised up with Jesus forever.
Jesus loves you and wants to bless your life freely :) Most of all, Jesus wants you with Him forever, and not in hell. The truth is that every belief except one will lead to eternal torment in the lake of fire for every person. Because nothing pays for our sins except the death and blood of Jesus, the sacrifice of Jesus that is already accomplished by Him . Jesus loves you! The truth is that Jesus is God, and Jesus died on the cross to pay for all of our sins in full, and then Jesus resurrected from the dead. Nothing else pays for our sins, not works, not deeds, not religions. So the only way to heaven and to avoid hell, is by believing in Jesus for eternal life (John 6:47), without adding any of your own works (Romans 4:5). Believe in Jesus to take you to heaven, and you will be in heaven, no matter what, guaranteed. That easy, thanks to Jesus! Tell Jesus that you thank Him that you will be with Him in heaven when you die, because you believe in Jesus! It is too late to be saved, after death