WHY do you think you have a bunch of water in your tank and lines??
Your first post and your second post( this one ) gives no clue of your assumptions of water problems.
Is it that because you added a tiny bottle of heet and you THINK your truck runs a LITTLE BETTER? yet in this post you say it only accelerates up to to 15 mph, I aint trying to be a dick but WHY do you THINK you have this terrible water issue? maybe if you tell us, people can help more.
You know that truck of yours is a big WOPPING 21 YEARS OLD!!!!!!!!!!!!!!!
Could it just be a kawinkie dink that when you filled up your tank that it just started having an issue after alllllllllllllll these years? I am just saying