Depends how many mg you are putting in the mlwhat would you say is a good dose like 1 mL? To start with? Or even 0.5 until I see how that is???
For coke I'd personally start with 100mg (0.1g) in at least 0.5ml of water, but everyone's tolerance is different. I've done up to to iirc 400mg in 1ml but tbh that was too much and made me feel horrible like my heart skipping beats, drip with sweat and throw up lol.