Hahahaha
this is really a weird thread, but let's try to transform it in a useful thread.
So first define doping and drugs. If it's illegal in WADA then it's doping. If you need a prescription then it's a drug (medicine), if you buy it in the streets then it's drug (dope). And this I strongly suggest you to avoid.
So let's stick to something you can use and buy legally. Possibly useful for others.
To keep your breath longer, you need to learn to keep you breath. So everyday do dry statics for 1 hour. Rest every 3.
Then you need your body to adapt to low oxygen, so you need:
- Iron to help build myoglobin and store oxygen,
- Proteins and amino acids to keep muscle tone,
- antioxidants to help remove free radicals after training.
- general vitamins because you are stressing your body a lot, so vitamins in general can help
- When you dive (or hold your breath) be sure you haven't eaten for at least 12-14 hours, and train your body to starve and lower metabolism.
All this can be from natural sources or bought as sport supplements. Nothing strange or illegal.
If you plan it well you will increase breath hold time.
If you don't crack (mentally or physically) because of over training you will succeed.
I don't think there are many drugs (medical or illegal) that will help you with breath holding, as these are generally meant to increase performances, not decrease them.
You also need to be very lucid when you attempt deep dives, otherwise you will never succeed.