I doubt that the calories you consumed and the calories you were told you consumed are the same. Plus how much of what you consumed resulted in water retention?
The mass of the food you eat won't necessarily tell you how much weight you'll gain. Or lose. The interaction of the food you consume with your body is more relevant to how much you gain or lose.
If the food you eat causes your body to build body fat, or retain water, or build muscle, you'll gain weight. If you eat food that results in less of these interactions, you'll lose weight.
Calories or rather, food with a high calorific content that your body can metabolise, sugars like glucose thatvattract water molecules within the body, and high protein food combined with exercise, all contribute to weight gain.
Since I went low carbs, and thus low calorie, and lost a lot of weight, I've found myself much more thirsty. Drinking a couple litres of water a day in addition to tea & coffee, is essential for me.
Again, no one has ever consumed a single calorie, ever.
No one will ever choke because some calories went down the wrong way.
No one ever knocked over a cup of calories.
A calorie cannot affect you, in the same way that a cm can’t. You could sit on a 1cm tack and that would affect you, but it wasn’t the ‘cm’ that hurt you.
Centimetres, litres, kilograms etc are all perfect measures. Whereas a calorie as a means of measuring energy converted from food is totally unreliable as it is not constant.