Is there some way someone can edit the world? I have tried different things and i cannot find anything that works.
If you're fairly sure the reservoir is in your inventory, you can probably edit it out with NBTExplorer, if you can find the right file to edit. I'm not sure which one it would be.
If not, you should be able to open the world up in MCEdit (AFTER making a backup somewhere), and find the item entity and delete it. There are some versions of MCEdit that will corrupt your world if you do this, but this has probably been fixed in more recent versions. Like I said, make a backup first, just in case.