Like you have implied, Crack Cocaine must be treated to reduce it back to a salt, otherwise it will not be water soluble. Typically, lemon juice (not recommended), vitamin c packets and vinegar are used to reduce Crack Cocaine to a water soluble nature. Are you aware of how dangerous this practice is my man?
Speedballs took down several figures that I'm familiar with who could consume seemingly endless amounts of Cocaine, Barbiturates Heroin or what have you. They speedball is the peacemaker for a lot of these guys. No matter your tolerance, Speed Balls, especially by the intravenous route, are of the most dangerous drug taking practices that we are currently aware of.
We are Harm Reduction so I had to play mother there for a second. Please consider the consequences and please try to use with a friend or acquaintance if possible.