^That method is nowhere near accurate. Each eye dropper will be different and you would need a scale to weigh the initial 100mg (or whatever) dose. And water is nowhere near suitable for etizloam, it's a totally different chemical.
I've already told you how to do it - keep it simple and use pg or high concentration alcohol to do a 1:1 ratio. This way you don't have to try and calculate your dose using multiplication/division, and with a bit of subtle heat and mixing your etizolam should be adequately dissolved.
If you don't mind my asking, why are you so hesitant to go ahead with this? Its been over a month since you first asked; I'm surprised you even have any powder left. Like I say, the equipment costs about £5, if that.