<qa>  How many glasses of water does the computer ask participants to drink?There are different amounts and different times that people will be asked to drink water, this is so that investigators can find out if there is an optimal volume of water to drink, and a best time to drink water to reduce headaches or hunger. The least amount of water the computer could ask participants to drink is half a glass that is 4oz or 120ml. The largest volume of water the computer could ask a participant to drink would be eight glasses of water a day a total of 64oz or 2L spread across the day that is not all at once. Once the computer has assigned participants to a particular volume and times to drink water, these will remain the same for every day throughout the study. 