What can I do with Rotten Flesh?

Solution 1:

Rotten flesh is quite useless but it can be used as a good source of food. Despite having a 80% chance to drain your hunger, it heals 20% of your hunger. You can cure the hunger by drinking a bucket of milk, which may seem like inventory space waste, but still...

It does heal wolfs however without hungering them.

I honestly don't know what else you can do with it :/

As for the spider eyes and glass bottles, I recommend you start your own brewery (not beer, just potions). With the spider eyes, you can create a mundane potion or a potion of poison, or you could ferment the spiders eyes using mushrooms and sugar and create potion of invisibility, potion of weakness, potion of slowness or potion of harming.

For more information, I recommend looking at the relevant wikis:

• Fermented Spider Eyes
• Spider Eyes
• Zombie Flesh

Solution 2:

Sell Rotten Flesh to a villager cleric. Then you can fill up the chests with emeralds,use them in trades or pack them into blocks to build with them or by putting them into blocks to occupy less space in the chests. Also,you can feed wolves with it. If you give rotten flesh to wolves when they have full health,they will enter love mode and breed. Giving (almost) ALL of the rotten flesh to the wolves will allow an army of 1000+ wolves in time! If you really don't want it anymore,you can throw it in lava or fire,but this is not the best solution.

Solution 3:

As stated by @ReallyGoodPie, you can use rotten flesh as a source pf food, but you could also use it too breed wolves