Start with the right pod and bottle tip
Use the pod that came with your kit, or a replacement pod sold for your specific device. Generic pods that look the same on the shelf often have slightly different fill ports and different seal heights. The bottle helps too. A bottle with a fine pointed tip or a syringe-style refill bottle is far easier to aim than a wide-mouth dropper. If your bottle has a screw-off cap with a stubby pour spout, decant a smaller refill bottle for daily use. The mess problem is usually a tool problem.