I'm From the UK and about 8 hours away from where I stay, there are reports on the news about parasites in tap water making people ill. My birds get tap water, it's also all I drink as bottled water tastes and fells horrible to me but I am now worried about giving it to my birds. Should I change to bottled water or filtering..?? If bottled, what one is better for them..?? If filtering, which one..?? I have used filtered water before but it left a black residue on the bottom of the bowl so was put off using it at that point