Situation You do not have a washing cup of at least 4 fl. oz. (119 ml) and you need to wash hands after sleeping or before eating bread.
Status You may not substitute a smaller washing container (such as a 2 fl. oz./59 ml cup) and use it twice. 
What To Do You must travel up to 18 minutes away to get such a container when needed.
Note If you have a spigot that is less than 12 inches above the ground, you may open the spigot and let at least 4 fl. oz. (119 ml) flow out, close the tap, reopen it, and repeat.