Counter strategy vs. Corrupting Potion

Watch for when they start drinking, and try your absolute best not to trade with them during that time.

That's what they want. Sense it adds to their trading power because of the damage over time.

Best advice i can give is try to trade when they aren't chugging that potion :D.

Super sustain. People often use Corrupting Potion on Mana hungry champions, so if you start with 4 health pots, you can sustain through all of the trading and run their mana pool dry. Try not to trade while their pot is active, as well.

just buy any other item that isn't trash and you are game.