There are several ways to increase sperm volume quickly. First, make sure you're getting enough vitamins and minerals in your diet. Foods like eggs, oysters, bananas, spinach and nuts are all great sources of zinc which can help boost sperm production. Additionally, regular exercise is important for increasing testosterone levels which can also help with sperm production. Finally, reducing stress levels by practicing relaxation techniques such as yoga or meditation may also be beneficial for improving overall health and fertility.