Yes, just don't go over 2 quarts/pound for the mash. I like to mash with about 1.5 quarts of water per pound of grain.
Assuming you have a 5 pound grain bill, that would be mashing in with 8 quarts of water. You'd "lose" 1 gallon of water to absorption, so you will get out about 1 gallon of runnings. Then you could sparge with a gallon, for equal runnings. Measure the runnings, and take an OG (cool the sample first). Add water to get to your boil volume, and proceed. Once you know your OG, you can figure your efficiency and add the correct amount of extract needed.
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