How do you find ingredients in the game? Example, for the love potion?

These are called items. You can buy them in the game store by going to Services>Store>Items. You may have to wait for them to appear there though. You can also buy them from other members by going to Search>Search Items and Decor then selecting the item from the drop down menu. Sometimes the game will randomly give you an item, but this is completely random. There isn't anything you can do to make it happen or get a certain type of item this way. Hope this helps!