( ( ( A ( heat pack ) ) ( like ( ( the one ) ( you ( are describing ) ) ) ) ) ( ( contains ( sodium ( ( acetate and ) water ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN heat) (NN pack)) (PP (IN like) (NP (NP (DT the) (NN one)) (SBAR (S (NP (PRP you)) (VP (VBP are) (VP (VBG describing)))))))) (VP (VBZ contains) (NP (NN sodium) (NN acetate) (CC and) (NN water))) (. .)))
A heat pack like the one you are describing contains sodium acetate and water.
(ROOT (S (NP (PRP You)) (VP (MD can) (VP (VB find) (NP (NN sodium) (NN acetate)) (PP (IN in) (NP (DT a) (NN heat) (NN pack))))) (. .)))