About the sugar… a friend of mine went to a specialty coffee place in Italy and when a customer asked for sugar, they peacefully told him that the sugar cannot be part of a good coffee 🤷🏻😂😂
It is pity that your coffee was brewed in advance… this means a lot of oxidation occurs and even if the coffee was initially good, it was soiled after a generous amount of time…
Luckily, this was coffee and after all coffee always makes us happy.
Best wishes!