Soft-x-ray cryotomography allows quantitative and high-resolution three-dimensional imaging of intact unstained cells. To date, the method relies on synchrotron-radiation sources, which limits accessibility for re searchers. Here we present a laboratory water-window microscope for cryotomography. It is based on a $\lambda =2.48\mathrm{nm}$ liquid-jet laser-plasma source, a normal-incidence multilayer condenser, a $30\mathrm{nm}$ zone-plate objective, and a cryotilt sample holder. We demonstrate high-resolution imaging, as well as quantitative tomographic imaging, of frozen intact cells. The reconstructed tomogram of the intracellular local absorption coefficient shows details down to $\sim 100\mathrm{nm}$ .