When is the best time of day to weigh myself?

I heard most people on normal diets weigh themselves in the morning when they’re on an empty stomach however since I eat my one meal at night I was wondering if weighing in the morning is the most accurate. Throughout the day while drinking a gallon of water my weight goes down and I evaluate the accuracy of my scale every time by placing a 15lb and 20lb dumbbell on it. So is weighing myself after rest the most accurate since it’s not when my stomach is empty?
 
I have always read to weigh yourself after you had your first bowel movement. I usually weigh in the morning.
 
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