06shooter said:
What about citric acid from a grocery store ?
As long as it's pure citric acid, it'll be just fine.
I had quite a difficult time finding some in my area, a few years back. Even the food storage, restaurant supply, and canning supply places didn't have any. And it was stupidly expensive online.
Finally, I found a candy and cake supply shop that sold it in 5 lb bags. I didn't need that much, but I got 5 lbs of pure, food-grade citric acid for less than I could have paid for 8 ounces online.
Since it's more than I'll use in the next 20 years, I also use it when I get bored. 1 part citric acid + 3 parts sodium bicarbonate (baking soda) + gigantic veterinary capsule* + bottle of warm water = fantastic reactive target. (Via carbon dioxide release.)
Mix dry ingredients and fill capsule. Insert into bottle. Walk back to the firing line and wait for the capsule to dissolve.
When bottle suddenly begins to RAPIDLY pressurize, put a bullet into it.
BOOM!! ....And the chemical solution released won't hurt anything. It's less harmful than Coke. Just pick up the pieces of the bottle(s) when you're done.
*The veterinary capsules that I use are
massive. They're 1" in diameter and 3" long (24mL, Torpac #007). About 5 years ago, I calculated that a citric acid / sodium bicarbonate capsule in a sealed 1 pint aluminum beer bottle with no air gap could theoretically pressurize the vessel to almost 4,500 psi; or easily 450 psi with a minimal air gap (something like 1"). Aluminum bottles are only pressure tested to 50 psi or 75 psi (often 75-150 psi for plastic), depending upon the design; so capsules that massive are definitely not necessary and completely negate any chance of 'priming' before transport.