32,000 hit points
Wait until you are in the house. Go to the kitchen. Take the frying pan. Take the poison that is next to the dumb waiter, and the other poison on the counter. Create poisoned wine. Drink the wine. Hold the [Enter] until the "Inventory And Actions" list appears again. Your hit points should be lower than -1000. Repeat this process until your hit points are out of the negative range. You should have approximately 32,000 hit points. Use the frying pan to keep sober.