Mini made 2 kg fruit jam and packed in 3 bottles of equal size.How many kgs of jam will be there in each bottle?

Everyday from one bottle ¼ is taken for breakfast.How much kgs of jam was taken from 2 kg everyday? Can you say the quantity in grams?

each bottle will hold 2/3 kg of jam

Assume you meant that 1/4 kg is taken for breakfast from one bottle,
then 1/4 kg was taken, or 2-1/4 kg was left after the first day, which is 7/4 kg

Yes, I can say the quantity in grams, since I know that 1 kg = 1000 g

Your last question is quite ambiguous.