Cooking
A dash of nutmeg will take out a burnt taste
A cut up potato will take out too much salt
Cut up carrots will take out too much picante/caspicum
Never ever try to more than double a recipe. Make multiple batches

Gardening
A small spoonful of Epsom salts in the tomato hole helps them produce more
(Allan, your tomato trick didn't work at all for me--soil too sandy)

Herbal Vet/Medicine
If your critter has the runs, feed it canned pumpkin, a tablespoon or so a day
If your critter is severely constipated (as in an emergency), force any kind of oil (veg, safflower, etc) down it's mouth using a large syringe or baster
Comfrey/aloe salve is great for abrasions etc.
For dogs 'blowing coat', comb as well as possible, wet down, slather in baby oil, rinse out using the hottest water possible. Shampoo and rinse as usual. Helps a lot

I know there is more.........