Two reviewers have commented the manuscript. Revisions required are mainly related to (i) giving more specific information, and (ii) rephrasing some statements. The authors have answered in detail to the reviewer recommendations, and the manuscript can be revised accordingly. If so, the manuscript can be accepted after these minor revisions have been made.

The authors have revised the manuscript according to the helpful comments of the two reviewers. The manuscript can be accpeted, and this technical note will be very helpful for isotope hydologists collecting water samples with state-of-the-art water samplers and minimizing the effect of isotope fractionation during sample collection and storage.

I only suggest some minor, techincal corrections:
- line 206 of the revised version: "... is the saturation vapor pressure (kPa) at the air temperature T (°C),...."; and then delete the definition of the air temperature in line 207
- line 283 "humidities" and not "humilities"
- line 290: "very" can be deleted
- even though 𝚫𝟐𝐇 was defined in the text, I would prefer to have 𝚫𝛿𝟐𝐇 as it is the difference of isotope ratios given in the delta notation and not only the difference in deuterium (applies to entire manuscript and supplement)

Congratulations and thank you for submitting your mansucript to HESS
Christine