Get a 10 foot drinking water hose and two 20 foot drinking water hoses. When the water spigot is right next to you, use the 10 footer. When it is farther away then connect them together - as needed.
All images are clickable.
For rinsing the sewer hose, get on of these, and one of these - or whatever hose you want as long as you don't confuse it with drinking water hose or store it with the drinking water hose(s). It's not a good idea to rinse sewer hose with a drinking water hose. You don't want to risk contaminating the drinking water hose with waste:
 
...and some 
dump gloves for the squeamish and OCD.
Get a 
pair of pliers for when the cap on the sewer pipe at your site is misthreaded or cranked on really tight.
