Items

=Consumables= Consumables are vital for staying healthy overall, whatever it's quenching thirst, patch up bullet holes or protecting yourself from the deadly radiation of the conflict area.

Food

 * Caviar
 * Canned Food
 * Condensed Milk
 * Kidney Beans
 * Water

Meds

 * Medkit (Heals to full health, does not stop bleeding!)
 * Bandage (Stops bleeding but doesn't heal)
 * Anti-Radiation Meds (Makes you immune to the radiation for some time)
 * Energy Drink (Makes you move faster)
 * Vodka (Partially protects you from radiation)

=Keys and Flash Drives= Flash drives are necessary to reveal the code needed to enter through the bunker door, while keys provide access to locked up places filled with RU.

Flash Drives

 * Black and Red SD Card
 * Blue Flash Drive
 * Red Flash Drive

Keys

 * Garage Key (Opens the two orange-brown doors)
 * Apartment Key (Opens the brown door on the fourth floor of the tall building)
 * Fuse (You'll need three to get the elevator running)

=Ammo Types= Various types of guns need various types of ammo too, although this is perhaps too much...

Bullets and Shells

 * .5.45x39mm (All variants of the AK)
 * .5.56x45mm (Most assault rifles)
 * .7.62x39mm (Light Machine Guns
 * .7.62x51mm (Sniper and marksman rifles)
 * .9x18mm (Most submachine guns and modern pistols)
 * .9x39mm (VSS, Bizon PP-19 and OST-14)
 * .12x76 Gauge (All shotguns except the TOZ-74)
 * .22 LR (Revolvers)
 * .45 ACP (Thompson and KRISS Vector need this, along with TT and Colt 1911)
 * 12 Slug (Special ammo for the TOZ-74, kinda rare find)

Launcher Ammo

 * .40mm Grenade (RG6, Grenade Launcher)
 * PG_7V (RPG-7, Rocket Launcher)

=Other Items=

Loot
Those are items you will want to have when leaving the conflict area.
 * Container (Contains gears, weapon skins or parts)
 * RU (Needed to buy containers in the store)
 * Dog Tags (Mostly used as trophies but also for quests)
 * Instruments (Found in one of the locked garages when doing the quest)
 * Valuable Cargo (Found in the locked apartment when doing the quest)
 * Documents (Found in the locked safe in the bunker when doing the ques)

Accessories
Those things help you explore the conflict area more safely.
 * Binoculars (Works like scope on gun, allows you to see farther)
 * Geiger Counter (Ticks more intense the nearer you are to the radiation)

Grenades
Thrown explosives designed to kill or immobilize enemy soldiers.
 * Frag Grenade (Shoots shrapnel in all directions, has much longer range than expected)
 * Flashbang (Makes you blind for quite a time)
 * MK3A2 (High explosive grenade)