Load and loads work just as well as bunch.
- There's a load of water
- There are loads of books on your desk
- There's a load of books to carry
- I had to study loads before my exams
- Save loads of money on your car insurance
An even more colloquial (and vulgar) one-word expression is shitload, used to describe an impressive quantity of something.
- I want a job that makes a shitload of money
- I have shitloads to do