Simply stick the needle in a body and pull the trigger to harvest the Adam then you can drink from the bottle to gain mana and health.
Can be found in the Bioshock section
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If you only care about the health part you won't need to download the Zero Mana mod.
I've decided to put 90% of my attention on making this Bioshock overhaul mod. here is a list of the mods coming up soon
Eve hypo: already have it working just need to make a model Electrobolt: already have it working just need to add sounds and effects (this won't be a reskin) cyclone trap: I have a very good idea of how I'll make it insect swarm: I have a very good idea of how I'll make it drill: I have a very good idea of how I'll make it maps: vague plans splicers: vague plans
I will further explain my full plans at a later date but this is just a small look into what I've been working on.