My mother acquired a piggyback plant about a month ago. The pot contained two "bulbs" (where the stems sprout from) and they both looked reasonably healthy. As is custom, we re-poted the plant, watered it, fed it some fertilizer and let it sat by a window with filtered light, in the kitchen. A few days later it started showing signs of declining health and becoming droopy.

Our country is extremely hot and dry during summer (30Cº - 42Cº) (86ºF- 107ºF), and the past month we suffered a peak of temperature. Since this house has 4 people in it (and sometimes over-watering and other issues are common) my mother decided to bring it to her room and take care of it herself. I do not know how what she did but fact is... the plant didn't improve. In fact, it got worse because she placed it by the window and the noon sun hits that side of the house like a beacon with a magnifying glass.

She gave up on it saying it's doomed and was about to dump it when I stepped in and asked to take care of it. I'm new to gardening and I really wanted to save this piggyback so I dove my nose into research for a couple of days until I grasped the basic idea of what to do. My mother re-poted it again (twice in a month - which I assume is very stressful for the plant) but one of the bulbs was poorly placed and started drying out for being too exposed. I did not notice what the problem was until it was too late. I still haven't removed the dead bulb in fear of damaging the other one.

Piggyback plants like moist soil, humidity and filtered light. I water it as soon as the soil starts to get dry and mist its leaves almost every day. I'm also careful to make sure it doesn't get any direct sunlight (it really doesn't like it - too much brightness and it gets all droopy in a matter of minutes). Now the plant has another issue which I think its a result of all the stress it has suffered - it started developing brown spots on the leaves which I've researched and I'm almost 100% sure its a case of anthracnose. Its on its early stages but it has spread to the entire plant.

QUESTIONS:
-- How do I help a Piggyback plant suffering of anthracnose and extreme stress in a very hot, very dry environment?
-- Is anthracnose contagious to other plants?
-- Tolmiea is a hairy plant that enjoys humidity. Should I keep heavily misting its leaves or will the water cause any issues? PS: I don't mist at night and the tap water I use usually stays put for a few hours to let the chemicals disperse.