What should i do about my mean mcdonald manager?

Ok, so im a teenager and my manager at mcdonald is really rude. I exercise my body daily and eat in high calories to gian muscle so therefore i feel thirsty very often and drink a lot of water. One day iw as working on frys and at mcdonald we keep our dirnks at a certain place where everyone keeps their drinks so customers don't see it......After my frys were all good and i had enough i went twice in 20 minutes to drink water from my cup at that place like few feets away from frys machine. last itme i went(3rd time) my manager tells me to throw my water away and not dirnk water because he feels i keep coming back every seconds....now really? i am the one dirnking water im thirsty the frys making place is really hot and im not used to that environment and he is stopping me from drinking water? what can i do about it? and one time he told me to get frys from the back i got them and it was reallly busy i was working on meat production and i put the frys box form the back and put it by the frys machine i thought he could put it in sinc emy emat is slwoing down and i needa make it really fast, then he yells at me and says dont leave da damn frys here put them in too (putting frys in the machine takes like 2-5 minutes..by then ill be really behind on meats...den i ask who is suppose to look at meats then huh? and he doesnt reply..most of the itme i feel like he's racist because i am from a different country. What can i do? I don't feel comfortable working with that manager...