I want to know how to become a water carrier and if there is any way to become one without being a physio or another type of medical person ..?

You won't be able to be just a 'water carrier' with restrictions on the amount of people clubs are allowed to have on the ground you will almost certainly need to have some medical/physio training. edit, I used to sell pies at Windy Hill, does that count as working for the League?