This video shows how you can filter water coming out of a lake or river to fill your tank. You see it is not too complex. Gavin runs the 12V Power 40 meters down to the pump, which pumps the water through some filters to his RV. This is what I use to pump and filter water from the river while on our camping trips etc. It is a 12-volt water pump system, used to fill the RV tanks on our caravan, using the batteries from the RV caravan or 4WD vehicle for power. We don't run the van from this water pump, the RV pump does that, we just fill the RV tanks, then pack it away. This system works quite well and it does what I wanted it to do. It also works well as a portable camping shower, pumping from a drum filled with warm water and a handheld shower rose with a hose fitting. Note, I am not an electrician or a filter expert, The quality of this river water is quite good, water filters will not make contaminated water good to drink, you would need something like a Lifestraw Filter for that. I am happy with the way this works, If you are going to make something make sure what you do is safe for you and your kids, This is the way I have done it and the experts may not agree it is the way to do it. (Check that what you are doing will not harm you in any way, ask the people that know, eg: electrician and filter people, just so you feel confident). The 12v water pump, I used is a Shurflo pump 4009 Fresh Water Pump 12v 11.3Lpm
FILTERS The Twin Blue Water Filter, the first filter the water goes through is a (0.5 Micron Sediment Dirt Pre Filter) and the second one is a (1 Micron Carbon Block Filter) this one Reduces Chlorine Taste & Odor. The last filter in my system is a 322H B.E.S.T Inline Water Filter.