Having just started playing on Hardcore, I'm wondering how viable surviving on Hardcore in the FO3 DLCs is.
Main Concerns are Anchorage and The Pitt. Since there's absolutely no food, water, or places to sleep in Anchorage, the viable thing to do (like what was done in FWE) was to make the health machines restore max FOD, H2O, and SLP. The Pitt has some unique ingestibles that I wonder if they've been adapted to NV's Hardcore mode (again we did that for FWE) and maybe place some more survival items in places like The Steelyard, as the player has the potential to spend a lot of time in there without their own gear if they want to look for all the ingots in their first visit (like I do).
Broken Steel shouldn't be an issue, but raising awareness in case it is, hoping Aqua Pura, and new Ingestibles are Hardcore certified. Same with Point Lookout.
Mothership Zeta could be a concern if the player travels light and expects to find food items inside the ship, one would need to make the alien ingestibles hardcore certified. Maybe add some hotplates to hub locations on the ship and some alien survival recipes too.
alien food already reduces hunger and I also think that a hotplate was placed in it already, and there is a bed in that place where all of the temporary followers wait if I remember (I am now testing MZ on Hardcore). In the Pitt there is the 
.
