You can use a spring water bottle of 1liter, 2liters (best) , this equals 0.25 gal and 0.5 gal or more .
You will take or use only the quantity you want !
Don't forget to mix with the water baking soda or salt, if you want to know the proportions just ask,
Your hose , one end will be placed in the bottle filled of watertie the hose with a rubber band at the top of the bottle,
now you hold the other end of the hose ABOVE the water level in the bottle,
put the end of the hose in your mouth and suck at once strongly, your mouth is 1 or 2 feets above the water level,
the hose will be filled with water,
connect the nozzle you have found,
placing the nozzle (output) a few under the water level the water will come out of the douche(or hose if no nozzle)
now you fold the hose at at some distance of the output, and hold it tightly folded , so the water can't come out,
ptake some lube and lube your anus, put some lube just inside too,
this will lube and relax your muscle,
insert the nozzle or the hose in your ass and unfold the hose,
hold it in, and go lie on your back on a towel on the ground , or on your four ,
the bottle and the water level have to be 15 inches or 1.5 feet above your belly button,
this is a question of pressure comfort and safety.