I have distilled/purified water stored in 5 gallon containers that I use for mixing.. Per panel, how many, lets say sprays should I do, does the panel need to be completely soak or just misted??
Just a fine mist is all that's needed, I would take Todd up on his offer too!

. Thank you Todd!!
Here's my long hand tips (now you will see why Todd said "call")
Hydro2 Tips:
Rule #1 wash the car
If it has wax or sealant use a soap that will kill that a bit. (Iron x and claying optional)
Rule #2 rinse well and apply a fine mist of Hydro2 (diluted AT LEAST 3:1 to the wet / cool surface
- RINSE after that section which will be about 30 seconds at most from when you started (this basically means you break the car into 5-6 sections at a minimum.
NOTE: Rinse means you rinse everywhere the product did or may have landed or floated in the air or dripped onto.
Move to next section
That's it
For instance if your spraying the passenger side and you see the wind is blowing away from you just go ahead and assume you will be rinsing all the horizontal surfaces to avoid tiny overspray dots.
So, you sprayed the passenger side, it's 20-35 seconds later or sooner if your really fast, you pick up the hose and turn it on. FIRST thing you do is spray off the roof and horizontals really fast to dilute any mist up there (takes 5 seconds to dilute it) and then get to the side you intended on. If you think your moving too slow then run a mist of water across the whole side and then rinse more thoroughly immediately after.
If your slow then break the car into 8 sections or even more if you want to be safe.
Glass: if the car was baking in the sun and the interior was 180F consider the fact the glass may be warm and you need to cool each panel a bit with running water before a fine mist of Hydro2 etc