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get yourself a submersible 200+gph pump ($15 or so), attach a 3' x 1/2" or 3/4" hose to it and drop it in your reservoir. when you are ready to change out your reservoir, get a 5 gal bucket, place the loose end of your hose in the empty bucket and power on your pump. once the reservoir is empty, pour the bucket contents down the toilet.
or
if you have a drain (toilet, shower, sink) somewhere reasonably close, run you a hose long enough to reach the drain from the pump in the reservoir, turn it on and drain away.
regards,
linedrivr
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