( ( Most experts ) ( ( agree ( that ( ( this water ) ( will ( ( stay safe ) ( for ( ( only ( a few ) ) days ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NNS experts)) (VP (VBP agree) (SBAR (IN that) (S (NP (DT this) (NN water)) (VP (MD will) (VP (VB stay) (ADJP (JJ safe)) (PP (IN for) (NP (QP (RB only) (DT a) (JJ few)) (NNS days)))))))) (. .)))
Most experts agree that this water will stay safe for only a few days.
(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))))) (. .)))