1) He's leaving it up to Marty and his assistants the task to salvage ingredients from the tower and cultivate what's needed on the meadow/forest floors etc. For what cannot be found he tried to recycle what he could from the bars last month. Otherwise when an ingredient could be not be found, he synthesized it using chemical stuff, it just takes forever more time (that's what he's been doing for coffee- Virtually anything can be synthesized or at least he can make Ersatz of what he needs, it's just. Long, complicated and annoying).

2) If ever it explodes, would it cause a floor or more to be overcome by... Nuclear Radiations?