Yes you can charge oe bottle with 4 types of serums which relate to same healing aspect.
What is the purpose of combination 1 and 2 ??
ALL CLEAR SERUM works in multiple ways , you can charge water without any intention and allow it to work in all areas wherever its required to work.
So if both the bottles are for same person/people, you can even charge only one bottle with ALL CLEAR SERUM/PAIN CARE SERUM.
You can add PERFECT HEALTH SERUM instead in one bottle. Add BALANCE SERUM too.
Regarding charging in one go, you can charge the bottle with each energy back to back without waiting. Then you can charge the next bottle too.