I've done a completely different form of energy infusion, that people here might be interested in.
If you own a wand or a crystal point, those are shapes that are designed to project or direct energy in a beam, so you're already prepared. If not, holding the stone in your projective (dominant) hand and pointing your index finger is another way to go.
If you have a wand or quartz point, but the stone you want to use is something different, then holding the stone you want at the base of the wand will bring the desired result, as well.
Take the stone and/or wand (or hold the stone in your projective hand -- your dominant hand, or the hand you write with) and beam the energy into the container of water. Keep sending until you sense that your purpose is accomplished. Boom. Instant energy-charged water.
The benefit of this is that you absolutely, positively will not be putting any toxins into the water, nor will your water damage the stone. This will allow you to safely use a wider range of stones than the "put the stone in the water" method will permit.
These are the wands I use. I make them for others, as well, but I started out by making them for myself.
Wands are designed to direct energy and intent. The best example I can give is to show what happens when I use it to direct a VISIBLE form of energy: light. This is the result when I put a flashlight at the sceptre end of the wand.
Now imagine directing energy and intent in the same fashion that this physical light was directed. If you can do that, you can infuse pretty much anything with pretty much any energy.