My darkroom is permanently set up in a 8'x6' bathroom that's in our guest room. However, I've made it so that it can be a bathroom again in less than 10 minutes.
I bought wire shelf units, approx. 18" deep x 5', and have two of these permanently mounted 18" below the ceiling. All trays, wash tub, and misc. stuff stores up there. A third unit is at work height, and holds the trays of chemicals (only two trays: developer and TF-4 fixer. I use water as a stop, and because of the TF-4, don't need hypo clear for fiber prints). My enlarger is on a rolling table, and is backed up into the shower stall. When company comes, I roll it out and into a closet. I have a hose sprayer attached to the faucet, and use a plastic tote as a wash tub.
If I didn't have water, it would be easy enough to to fill the tote with water and carry it into the darkroom. However, a hose into your pantry sounds like a great idea. Sealing any light leaks from the hose should be a solvable problem.