No sweat, fren!
It's a cheap hobby… kek.
My pleasure. Remember not to drink only distilled water, you can give yourself debilitating mineral deficiencies.
Also, don't run it dry, the majority of the minerals will stay suspended until you do.
If you want a gallon of product, a 4L rig will give you that, and leave just enough left over to keep from baking minerals onto the bottom.
Save the electricity, measure the output, and stop when you're close. You'll be glad you did.
I wouldn't be surprised if he is paying for that (see Gretchen op).