Consumables
Consumables are 
Single Use items that are used up when activated. Due to their limited uses, they should be employed when the circumstances require it. However, most of them can still be regularly found in the inventories of many traders where they are refreshed regularly, thus allowing them become a staple of certain fighting styles.
Arrows
Main article: Arrows
Arrows are Consumables that are fired from ranged weapons to deal extra damage, create Surfaces, inflict Conditions or produce other effects.
Arrows can be looted, bought from vendors, but cannot be crafted.
Camp Supplies
Main article: Camp Supplies
Camp Supplies are Consumables such as Food and Drinks which allow characters to perform a Long Rest, restoring all Hit Points and expended Spell Slots.
While alcoholic beverages can be used as camp supplies, they can also be drunk with a 
Bonus action, granting 
Alcohol condition to the character or thrown to create flammable alcohol surfaces.
Coatings
Main article: Coatings
Coatings are Consumables that can be thrown, or alternatively, weapons can be dipped into them as a Bonus Action, to apply their effects.
When Thrown, they act as Grenades that create Surfaces. When a weapon is dipped in a Coating the effects last for 3 rounds, applying the Coatings's effect on each hit.
In some cases, weapons can be dipped in a Surface created by a thrown Coating.
Dyes
Main article: Dyes
Dyes are Consumables that can be combined with an equipment item to alter the colours of fabric, leather and metal.
Elixirs
Main article: Elixirs
Elixirs are Consumables that grant Resistance or other beneficial effects when consumed. Unlike Potions, Elixirs last until a long rest.
Grenades
Main article: Grenades
Grenades are Consumables that can be used with the Throw action to create Surfaces or inflict Conditions.
Potions
Main article: Potions
Potions are Consumables that restore Hit Points or grant other Effects when consumed.
Scrolls
Main article: Scrolls
Scrolls are magical Consumables that allow characters to cast Spells without expending Spell Slots. Scrolls can be very useful in situations when you do not have any spell slots left to cast spells.
You can cast any spells with the appropriate Scroll, even if the spell's level is higher than your highest-level spell slots.
Miscellaneous
Environmental
These items are (usually) found in the environment, rather than as loot. And can't be consumed, but must be damaged to activate any effects.
Nautiloid Tank
Large Nautiloid Tank
Firewine Barrel
Acid Barrel
Explosive Barrel
Oil Barrel
Smokepowder Barrel
Water Barrel
Runepowder Barrel
Tools
Other
For consumables that have no obvious beneficial use, see:
