Jfc that's a lot of work!

code/game/objects/effects/decals/cleanable/aliens.dm

@@ -9,7 +9,7 @@
 
 /obj/effect/decal/cleanable/blood/gibs/xeno
 	color = BLOOD_COLOR_XENO
-	gibs_reagent_id = "liquidxenogibs"
+	gibs_reagent_id = /datum/reagent/liquidgibs/xeno
 	gibs_bloodtype = "X*"
 
 /obj/effect/decal/cleanable/blood/gibs/xeno/Initialize(mapload, list/datum/disease/diseases)

code/game/objects/effects/decals/cleanable/gibs.dm

@@ -6,7 +6,7 @@
 	random_icon_states = list("gib1", "gib2", "gib3", "gib4", "gib5", "gib6")
 	mergeable_decal = FALSE
 	var/body_colors = "#e3ba84"	//a default color just in case.
-	var/gibs_reagent_id = "liquidgibs"
+	var/gibs_reagent_id = /datum/reagent/liquidgibs
 	var/gibs_bloodtype = "A+"
 
 /obj/effect/decal/cleanable/blood/gibs/Initialize(mapload, list/datum/disease/diseases)
@@ -120,7 +120,6 @@
 //Lizards
 /obj/effect/decal/cleanable/blood/gibs/human/lizard
 	body_colors = "117720"
-	gibs_reagent_id = "liquidgibs"
 	gibs_bloodtype = "L"
 
 /obj/effect/decal/cleanable/blood/gibs/human/lizard/Initialize(mapload, list/datum/disease/diseases)
@@ -148,7 +147,7 @@
 // Slime Gibs
 /obj/effect/decal/cleanable/blood/gibs/slime
 	desc = "They look gooey and gruesome."
-	gibs_reagent_id = "liquidslimegibs"
+	gibs_reagent_id = /datum/reagent/liquidgibs/slime
 	gibs_bloodtype = "GEL"
 
 /obj/effect/decal/cleanable/blood/gibs/slime/Initialize(mapload, list/datum/disease/diseases)
@@ -187,7 +186,7 @@
 
 /obj/effect/decal/cleanable/blood/gibs/synth
 	desc = "They look sludgy and disgusting."
-	gibs_reagent_id = "liquidsyntheticgibs"
+	gibs_reagent_id = /datum/reagent/liquidgibs/synth
 	gibs_bloodtype = "SY"
 
 /obj/effect/decal/cleanable/blood/gibs/synth/Initialize(mapload, list/datum/disease/diseases)
@@ -198,7 +197,7 @@
 /obj/effect/decal/cleanable/blood/gibs/ipc
 	desc = "They look sharp yet oozing."
 	body_colors = "00ff00"
-	gibs_reagent_id = "liquidoilgibs"
+	gibs_reagent_id = /datum/reagent/liquidgibs/oil
 	gibs_bloodtype = "HF"
 
 /obj/effect/decal/cleanable/blood/gibs/ipc/Initialize(mapload, list/datum/disease/diseases)

code/game/objects/effects/decals/cleanable/misc.dm

@@ -13,7 +13,7 @@
 
 /obj/effect/decal/cleanable/ash/Initialize()
 	. = ..()
-	reagents.add_reagent("ash", 30)
+	reagents.add_reagent(/datum/reagent/ash, 30)
 	pixel_x = rand(-5, 5)
 	pixel_y = rand(-5, 5)
 
@@ -27,7 +27,7 @@
 
 /obj/effect/decal/cleanable/ash/large/Initialize()
 	. = ..()
-	reagents.add_reagent("ash", 30) //double the amount of ash.
+	reagents.add_reagent(/datum/reagent/ash, 30) //double the amount of ash.
 
 /obj/effect/decal/cleanable/glass
 	name = "tiny shards"
@@ -126,12 +126,10 @@
 			playsound(get_turf(src), 'sound/items/drink.ogg', 50, 1) //slurp
 			H.visible_message("<span class='alert'>[H] extends a small proboscis into the vomit pool, sucking it with a slurping sound.</span>")
 			if(reagents)
-				for(var/datum/reagent/R in reagents.reagent_list)
-					if (istype(R, /datum/reagent/consumable))
-						var/datum/reagent/consumable/nutri_check = R
-						if(nutri_check.nutriment_factor >0)
-							H.nutrition += nutri_check.nutriment_factor * nutri_check.volume
-							reagents.remove_reagent(nutri_check.id,nutri_check.volume)
+				for(var/datum/reagent/consumable/R in reagents.reagent_list)
+					if(R.nutriment_factor > 0)
+						H.nutrition += R.nutriment_factor * R.volume
+						reagents.del_reagent(R.type)
 			reagents.trans_to(H, reagents.total_volume)
 			qdel(src)
 

code/game/objects/effects/decals/cleanable/robots.dm

@@ -13,7 +13,7 @@
 
 /obj/effect/decal/cleanable/robot_debris/Initialize(mapload, list/datum/disease/diseases)
 	. = ..()
-	reagents.add_reagent("liquidoilgibs", 5)
+	reagents.add_reagent(/datum/reagent/liquidgibs, 5)
 
 /obj/effect/decal/cleanable/robot_debris/proc/streak(list/directions)
 	set waitfor = 0
@@ -53,8 +53,8 @@
 
 /obj/effect/decal/cleanable/oil/Initialize()
 	. = ..()
-	reagents.add_reagent("oil", 30)
-	reagents.add_reagent("liquidoilgibs", 5)
+	reagents.add_reagent(/datum/reagent/oil, 30)
+	reagents.add_reagent(/datum/reagent/liquidgibs/oil, 5)
 
 /obj/effect/decal/cleanable/oil/streak
 	random_icon_states = list("streak1", "streak2", "streak3", "streak4", "streak5")

code/game/objects/effects/effect_system/effects_foam.dm

@@ -55,7 +55,7 @@
 		var/obj/effect/decal/cleanable/plasma/P = (locate(/obj/effect/decal/cleanable/plasma) in get_turf(src))
 		if(!P)
 			P = new(loc)
-		P.reagents.add_reagent("stable_plasma", absorbed_plasma)
+		P.reagents.add_reagent(/datum/reagent/stable_plasma, absorbed_plasma)
 
 	flick("[icon_state]-disolve", src)
 	QDEL_IN(src, 5)

code/game/objects/effects/mines.dm

@@ -136,7 +136,7 @@
 	victim.put_in_hands(chainsaw, forced = TRUE)
 	chainsaw.attack_self(victim)
 	chainsaw.wield(victim)
-	victim.reagents.add_reagent("adminordrazine",25)
+	victim.reagents.add_reagent(/datum/reagent/medicine/adminordrazine,25)
 	to_chat(victim, "<span class='warning'>KILL, KILL, KILL! YOU HAVE NO ALLIES ANYMORE, KILL THEM ALL!</span>")
 
 	victim.client.color = pure_red