Relax, some people want those crazy clan maps filled with secret rooms and silly features we normally wouldn't consider. But that's just fine, as long as they're making it themselves and not asking us to do it for them. Use these 'crazy' questions as a learning exercise, a lot of them have quite sensible single player uses.
You could use a func_regenerate as joodude says, it's the brush that makes resupply cabinets work. Or you could use a trigger_multiple with the output:
Output | Target | Input | Parameter | Delay
OnTrigger | !activator | SetHealth | 10000 | 0.0
Make sure you check the 'clients' flag so that players can activate it, also set the 'delay before reset' to a something small like 0.01 (it's in seconds)