Mashing with pumpkin

I have read through a bunch of threads and haven't really found an definitive answer on this. I am brewing my pumpkin beer tomorrow and am using the pumpkin in the mash. Do I need to increase the amount of water I need to account for the pumpkin? And furthermore do I need to increase my water to account for the rice hulls? I know I am in for a long day as the pumpkin will make for a very slow draining. Thanks in advance for any help you can offer, I already learned a lot on the pumpkin discussion thread.

when I made my pumpkin beer I did not add extra water it turned out fine exceptthe stuck sparge
have fun

Get ready for the longest sparge of your life, and remember if its still trickling it ain't stuck.

Thanks and yes it was the longest sparge of my life. I don't know what I am doing wrong but it takes me forever to collect the 6 gallons or so I need even in my prior batches. I am going to have to do some trouble shooting before my next brew. I have a 10 gallon rubbermaid with a steel braid. This was my 3rd all grain batch, the first 2 went pretty well, this one was much tougher. I missed my targeted gravity by a lot and had very poor efficiency. On a brighter note the beer really smells like pumpkin pie and tastes like it which is what I wanted and I had a nice yeast starter for it. Oh and using a refractometer was fun.