Are we talking cocaine or speed here?
You're for sure going to be able to get somthing usable back if you really put 2 full ounces of speed into one can of coke. But what a sugary mess.
If it really is speed maybe just forgetting the extraction and taking portions of it orally is the way to go. It's already flavored isn't it?
Next time use Evian or more appropriately Crystal Geyser and the extraction will be a breeze.