Adds a canteen full of literally nothing. (#373)

Co-authored-by: KoishiVibe <[email protected]>

code/game/objects/items/reagent_containers/food/drinks.dm

@@ -353,7 +353,7 @@
 
 /obj/item/reagent_container/food/drinks/flask/canteen
 	name = "canteen"
-	desc = "You take a sip from your trusty USCM canteen..."
+	desc = "A ruggedized metal alloy flask. Can hold a good amount of water... Or other liquids."
 	icon_state = "canteen"
 	volume = 60
 	center_of_mass = "x=17;y=8"
@@ -362,6 +362,12 @@
 	. = ..()
 	reagents.add_reagent("water", 60)
 
+/obj/item/reagent_container/food/drinks/flask/canteen/empty
+
+/obj/item/reagent_container/food/drinks/flask/canteen/empty/Initialize()
+	. = ..()
+	reagents.clear_reagents()
+
 /obj/item/reagent_container/food/drinks/flask/detflask
 	name = "brown leather flask"
 	desc = "A flask with a leather band around the sides, often seen filled with whiskey and carried by rugged, gritty detectives."

code/modules/client/preferences_gear.dm

@@ -821,6 +821,10 @@ var/global/list/gear_datums_by_name = list()
 	display_name = "Canteen"
 	path = /obj/item/reagent_container/food/drinks/flask/canteen
 
+/datum/gear/flask/canteen/empty
+	display_name = "Empty canteen"
+	path = /obj/item/reagent_container/food/drinks/flask/canteen/empty
+
 /datum/gear/flask/leather
 	display_name = "Leather flask"
 	path = /obj/item/reagent_container/food/drinks/flask/detflask