I recommend to get fishing net and fish, if you get a fish feed it to floppa for 100$ and 10+ food, if you get money bag it will give 500 - 5k randomly
Also forgot to say: Keep exploring the back rooms, you will eventually find what you are looking for down there. (And yes, speed potions stack, i believe up to like 25 extra speed which is incredibly useful, the speed is also permanent until you die)