I'm assuming these are homemade capsules? At any rate, your var and your filler that is inside those capsules are different molar weights so if you do split this apart and try and use just half of it:
1) it will taste like assholes
2) will not be accurate
3) will make a huge mess
This is assuming that your source actually used a remotely scientific method of accurately dosing his caps. If that isn't done right, then you may not be getting an accurate dose anyways. Homemade caps can vary in dosage and sometimes by a considerable amount. The best thing i can recommend is just round up. Meaning if you figure you need to take 2.3 caps, just pop the 3rd cap instead cause chances are your dosage on them is on the low side anyways.