Ride'em Cowboy! But what will the neighbours think?

We are lucky enough to have lovely neighbours, but I suspect they may have started to wonder about my sanity. Last night I could be seen hanging from an upstairs bathroom window waving a strange blue lasso around much in the manner of a wannabe cowboy, all in the interest of watering.
Before you ask, I too was unsure about the spelling of "lasso". "Lassoo" or even "lassoe" seems much more likely. Such were my doubts that I have consulted not one but two dictionaries, and "lasso" it is.
The lasso in question is a 15m length of hosepipe connected to a clever little handpump which I use to extract the contents of my daughters' bath (once they have finished with it, naturally), which in turn is used to water the garden. They think we avoid soap and bubble bath as it triggers eczema, and whilst that is true it also helps avoid soapy-tasting vegetables!
The hand-pump is a simple low-tech device with nothing that can possibly go wrong. I bought it last year but it has really come into its own this spring and summer. My original technique was to haul it up to the bathroom window on the end of a long piece of twine but it was forever getting stuck or wrapped around things on the ascent. So now I keep the whole lot upstairs and sling it out (pausing to check first that I am not about to knock out any passers-by). Being a person of relatively small stature this entails balancing on some pipework behind the loo in order to get my head and shoulders out of the window so that I can check my aim and get a good swing.
So if you are reading, dear neighbours: I'm not trying to throw myself out and no, I haven't lost the plot. I'm just trying to water it.

What to do about watering?

What to do indeed, when there is no water source at the allotment. We have the River Witham flowing by, about 100 metres away. But other than that nada. Zilch. Rien. 100 metres is a long way if you are carrying 2 full watering cans and are going to need 10-15 trips!
In previous years I have followed my lottie neighbours' advice: he waters well at planting time, looks after the soil with plenty of good stuff, and doesn't bother about water again. But this year we are officially in the drought area and it became clear that I was either going to have to water or watch stuff die. Hence this afternoon found me driving to the lottie with 71 litres of water in containers of various sizes stashed in the boot of my car.
The water is rainwater from a water butt and the containers are largely recycled so all fairly green so far. But driving it there??? If anyone can calculate the carbon footprint of that one I would love to hear from them!