Yeah, I thought of that when I was looking at it. Luckily, I have a very skinny eye dropper. It came in a bottle of liquid ferts or something. I forget which one now, it may have been a smaller bottle of Excel or maybe a bottle of Cycle. It's graduated every ml from 1 to 5 ml which makes the tip end of it pretty skinny so it should fit in there nicely.

I'm pretty clumsy so I figured the skinny neck in there would help to keep me from dumping the contents into my tank...