Checking water in containers?

Can anyone help me with a piece of code to check the water in a container like a small water bottle or bota bag ?

 

This should work:

Code:

int GetContentsInMililitres(Item item)
{
    if (item.contents == null || item.contents.allowedContents != ItemContainer.ContentsType.Liquid) return -1;    int amount = 0;
    foreach (Item i in item.contents.itemList)
    {
        amount += i.amount;
    }
    return amount;
}

 

Thanks !