Answer:54 oz.
Step-by-step explanatio
To find the answer we simply need to multiply the amount of water per minute (1.8 oz.) by the number of minutes.
First of all we need to figure out how many minutes we are multiplying it by. In this case it is half an hour, which is 30 minutes.
Then we just do;
1.8 x 30 = 54 oz.