Water weighs about 8.8lbs per gallon. Salt water weighs more. You can drink a bunch of water and retain it, thus being a few pounds heavier. You can then also pee or sweat it otherwise lose water and weigh a few pounds lighter.
This is why you should weigh yourself twice a day of you are trying to lose or gain weight, but do not pay attention to the day to day differences. Look for the weekly and monthly trends.
Also, pay attention to the “weight by water” markings on poultry. Some turkeys around Thanksgiving time have more than half of their weight added by salt water.
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