Hey Edena,
I think your character has a great chance to survive. Not guaranteed certainly, but even a first level Ranger or Druid would have a difficult time all alone. There is plenty of good survival advice already posted, and basic wilderness survival information is easily found on the Internet or at your local library. Prestidigitation is your friend.

Don’t be afraid to push it to its limits. The purpose of it was to allow the wizard to use magic to make his life easier and more comfortable as well as impress commoners. Bend it until it breaks
As far as wondering encounters are concerned, remember, most creatures, even dire creatures, want easy prey to hunt. Just by being careful, you can decrease your chance of encountering them. As far as the intelligent creatures -- such as orcs -- are concerned, it is unlikely that they will be specifically out hunting for you, so any little signs of your being there (such as small cook fires, or the odd footprint) will probably be overlooked. Even legendary trackers and hunters don’t notice things that they aren’t looking for. Again, careful is the key (or at least that’s how I would rule it if I was your DM).
By eating well, and staying as warm, dry and clean as you can, you will be able to stave off most illness. Shelter, water, and food are your priorities, worry about security after you have secured them. Monster encounters are a die roll anyways and no plan is foolproof. A good place to live, clean water and food you can control. The dice you can’t. In real life, people have survived worse, and they can’t cast spells.
All that said, Piratecat had the best idea of all -- sell the secret, make a fortune, and gain your abilities to boot.
Good Luck,
John