Mark your peroxide with the date of purchase.
It actually and absolutely detoriates back to plain water within three years.
I buy 5 bottles a year, mark em and toss the expired ones.
I also have iodine, alcohol and burn prep kits with burn bandages.
Had a friend who spilled a hot cup of tea, fresh off the stove, right on her leg.
I stopped for second, pulled the pants off, wet a rag with cool water and placed it on the burn.
I then grabbed my burn kit out of the car and performed my planned series of applications and then placed the burn bandage right over the burn.
three days later barely a noticeable spot where the hot water landed.
I use to keep a large aloe plant in my kitchen window. snap off a piece and the slimmy stuff within the plant is what is used for burns...they make burn medication out of it and it takes the pain away...