No. One cup equals 0.236588 liter. So, three liters is 12.6803 cups.
A tea cup can hold up to 5 liters
1 US cup = 0.236588236 liters
If you Google "1/3 cup in tsp", it tells us:
About three pints
No, a tea cup will hold around 25cl to 30cl, way too small for 6 litres (600cl).
1/2 cup is 0.1183 liters.
1 US cup is 0.2365 liters.
Three cups is about 0.7 liters.
1/4 cup is about 0.06 liters.
1 US cup of water is 0.2366 liters.
One litre= 1,000 millilitres You need 2,700 more millilitres to fill it.
It will hold up to about 7.57 liters.