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As a drop in solution I think thats pretty good. Just make sure the tank filler has a little breather, can be a mm or 2 in size ( you could go as small as a plastic garden spray fitting for example - I use a 3mm lin with an air fitting into a socket port in the top of the tank) so when the water is drawn out it wont suck the tank in, and as mentioned also, go for a smallish tap opening. I have discharge hoses going to both sides and they have a chain to keep the tap upright and also at least equal to the water level - very easy for a tap to be accidentally left open or get knocked and you lose the lot. If you go this way the hoses can be long enough for the kids to wash their hands outside of the car and you can also drape it into a pot for cooking- trim the length so it doesnt hit the ground.