Proper way to euthanize and anesthetize a frog?

i need to do both, i'm thinking chloroform with a cotton ball in a sealed jar. if someone has done this already be specific about the procedure. I don't have any needles for injection and I need chemicals that I can buy over the counter. tia

 

i don't want the cells to explode or cause tissue damage also I don't want to use the pith method.

yes I've done a google search.

if I can't get chloroform how hard would it be to make it?

edit: also I need something that doesn't effect the potassium ion channels as i intend to attach electrodes to the anesthetized frog.

 

some of the frogs can't die because I need oxygenated muscles alive for a short while plus I don't want to buy a gas cylinder, tubing, check valve and an evacuation jar just for this or use dry ice. i would pay for some chloroform if it was available , yea looking at you borek

 

btw what tissue (small as you can reasonably get) clamping probes are available?