Enceladus, a moon of Saturn is actually mostly water, but salt has been found in volcanic emissions ejected into space.
That said it’s not impossible that conditions exist somewhere in the universe where you have H2O and no NaCl since that is the salt we usually mean when we talk about salt water. Unfortunately it is not the only thing found to be mixing with water as on Jupiter, liquid water does exist but it mixes with amonia.
Enceladus, a moon of Saturn is actually mostly water, but salt has been found in volcanic emissions ejected into space.
That said it’s not impossible that conditions exist somewhere in the universe where you have H2O and no NaCl since that is the salt we usually mean when we talk about salt water. Unfortunately it is not the only thing found to be mixing with water as on Jupiter, liquid water does exist but it mixes with amonia.