If you can get your bucket higher than the fill hole then just use an oklahoma credit card (siphon hose). I suspect since you are already camping your options may be limited. If there is something on your trailer or a limb overhead you can throw a rope over a limb to help hoist up the bucket of water. Here is a video of a homemade funnel made from an office water bottle. old guy's option is best. I recently purchased a second 12 volt water pump. I took a 50 foot garden hose and cut it in the middle. one end has a screen in it like your washing machine. I throw this end in the stream of water and hook the pump to my truck battery and run the other 25 foot hose on other end of pump back to a barrel in my truck bed. When I get back to the RV I just reverse the process to fill my fresh water holding tank.
homemade funnel