does proton NMR detect water?

[stone1997]

is there a difference in NMR spectra between an analysis of a liquid organic compound and an aqueous one?

[lzxnl]

is there a difference in NMR spectra between an analysis of a liquid organic compound and an aqueous one?

For the reason in your title, you don't use NMR to look at aqueous species.
However, what do you mean by 'liquid organic'? Do you mean pure? If so, what are you conducting an NMR for?

If you mean something dissolved in the liquid organic compound, generally you'd need to use a deuterated solvent like CDCl3. Otherwise, your solvent will also show a HUGE peak in the spectrum. You only use like 50 mg of sample dissolved in the solvent for NMR. Using any solvent with H-1 instead of H-2 will create a solvent peak that ballooons off the scale.