Salt. One of the main causes of water retention is eating too much salty food. The main component of salt is sodium, which the body dilutes with water if too much of it is present. Salt makes you thirsty, and your body will hold on to this water.
Or reject it, or counter-offer your terms. Usually you should hear back from the seller within 2 days, unless the seller is a bank (foreclosure) in which case they can take up to 10 days to get you a response.
Ideally, your Realtor should get back to you right away, but, depending on schedules, should at least get back to you by the end of the day. It should just take a few minutes to gather the information on the listings. Then it could take an additional amount of time to confirm with all the sellers all the appointments for the showings.