( ( For example ) ( , ( ( each group ) ( ( receives ( water ( for ( one day ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (DT each) (NN group)) (VP (VBZ receives) (NP (NP (NN water)) (PP (IN for) (NP (CD one) (NN day))))) (. .)))
For example, each group receives water for one day.
(ROOT (S (NP (NP (CD One) (NN example)) (PP (IN of) (NP (NN matter)))) (VP (VBZ is) (NP (NN water))) (. .)))
One example of matter is water.