( ( Water ( The body ) ) ( ( can ( ( ( survive weeks ) ( without ( ( ( food , ) ( but only ) ) days ) ) ) ( without water ) ) ) . ) )
(ROOT (S (NP (NP (NNP Water)) (NP (DT The) (NN body))) (VP (MD can) (VP (VB survive) (NP (NNS weeks)) (PP (IN without) (NP (NP (NN food)) (, ,) (CONJP (CC but) (RB only)) (NP (NNS days)))) (PP (IN without) (NP (NN water))))) (. .)))
Water The body can survive weeks without food, but only days without water.
(ROOT (S (NP (JJS Most) (NNS people)) (VP (MD can) (VP (VB survive) (NP (QP (RB only) (DT a) (JJ few)) (NNS days)) (PP (IN without) (NP (NN water))))) (. .)))