Slim Xtreme is a blend of several ingredients, all with different particle sizes, and some of which aren't significantly water soluble. Moreover, it tastes disgusting.
Lastly, the capsules are packed with a unique nano-dispersion technology. Very basically, the ingredients are layered inside the capsule to give it that time-released effect that lasts all day. If you take out out of the capsule, it loses a lot of this characteristic. Packing these things into those little layers isn't exactly the cheapest process to do, and seeing as that makes it's way into the final price, you've already paid for this process to be done, why throw it out by breaking open the capsule?
Can you give me some more reasoning as to your logic behind doing this? The only rationale I can think of for such a thing would be if you feel it is too strong for you. In such an instance, I would recommend dissolving in everclear, and dosing with an eyedropper. Ethanol is a better solvent and it has a lot more of inert characteristics; whereas, water can function as an oxidizer in such instances.