Don’t know where water is coming in

With that much water coming in I suspect you have a water leak.. if the bathroom is above the kitchen especially.

Its difficult to diagnose without an inspection, I would began by inspecting the condition of the guttering and pointing in the areas where water damage is present

Hard to say without inspection, sounds like a problem with the guttering or a leak within the pipes in your building, also could be penetrating damp inspection recommend.

You need to have your roof checked on the kitchen also the guttering

This issue needs to be surveyed holistically - inside and externally. It is almost certainly not a case of rising damp needing a damp proof course, although it might be lateral dampness, if the external ground level is higher than the internal floor level and the wall is none cavity. Nor does it sound like condensation as the water would be visible on the surface of the wall and condensation would not usually be absorbed in sufficient volume to swell kitchen worktop units. We need to know if it is a cavity or solid wall too to help with diagnosis. The roof, gutters and downpipes and external ground levels all need to be evaluated. The property owner needs to be involved in answering questions such as if the problem is worse after wet weather etc. Ventilation and relative humidity within the room does need to be checked as such a matter maybe caused by a combination of several causes such as condensation, penetrating damp and roof or down pipe or gutter leaks. Anything against the wall such as shrubs, trees, and as noted earlier high ground level needs to be checked.