"There is milk in the bottle."
Translation:बोतल में दूध है।
What you wrote (दूध बोतल में है) can be understood as " The milk is in the bottle." which might be an answer to "where is the milk( i just bought)?" Or दूध कहाँ है? The translation asks for "There is milk in the bottle" (बोतल में दूध है) which might be an answer to "what is in the bottle?" बोतल में क्या है? Hope that helps!