The previous Halachas dealt with all the details required for a valid morning washing. The current law is a summary of cases in which one is unable to follow a certain requirement for the morning washing and its subsequent law. The summary follows the final ruling as explained in the Siddur. The rulings of Admur in the Shulchan Aruch have already been noted within the footnotes of the Halachas above.
One does not have enough water to wash three times If one only has enough water to wash each hand one time then if there is enough water to pour a Revius on each hand one is to wash with a blessing. If one does not have a Revius then he is to wash without a blessing. In all cases one is to rewash properly when water becomes available.
One does not have a vessel available to wash with: If there is water available but one does not have a vessel available to wash with, then one is to wash his hands without a blessing and when a vessel becomes available he is to rewash properly with a blessing. If there is a Kosher Mikvah, ocean, or body of rainwater in the vicinity then one is to dip his hands in the water and recite a blessing, although he is to rewash properly if a vessel later becomes available.
One does not have Kosher water available: If one does not have halachicly valid water available [See Halacha 7I] then he is to wash his hands without a blessing, and rewash properly with a blessing if valid water later becomes available.
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 See Halacha 7H and Halacha 12, based on Admur in Siddur unlike his ruling in Kama 4/3 which always allows a blessing of Al Netilas Yadayim to be said when washing with water, irrelevant of amount.
 See Halacha 7F and Halacha 13 based on Siddur unlike Kama 4/2-3 which rules one may wash with a blessing even if no vessel is available.
 See Halacha 7I based on Siddur unlike Kama 4/3 which rules that if one plans to guard his hands until Shacharis he may wash with a blessing.