How can l get all materials for Meko task

from my guide:

Not every option gives you an item, but some end up being very silly or interesting scenes that i warmly recommend checking out before actually collecting the item from the right guy (or load a save later), they are:

• dragon tears: Máng apparently has… no more tears to shed, the only other candidate is Hakan, but he apparently can’t cry either… despite our wolf playing foul, Witer has the perfect plan to get us some of those tears from him
• lizard saliva: for this, you can defeat any lizard rogue and forcibly take their saliva, or, if the lizard village still exists, buy some from the shopkeeper for 50 coins or ask Nauxus (i HIGHLY recommend that if you are dating him in your route, because phew…~)
• demon’s toenail: the demon guards at the entrance of the demon city have a very funny dialogue, but only the boss (the cerberus) will let you have one… in exchange for certain services~, you can even offer them again, if pleasing pleases you~ (but lewd choices will only amuse him and have you tease you, no further fun for now, paw lovers)

When you have everything, return to either Meko or Selye and let him craft the antispell rune (they both say they need one day, but going back at midnight is enough, not 24 hours).