A common sub for oils and other fats is applesauce. The consistency of the apple sauce keeps any baked good moist just like the oil would but with less fat.

If you’re all out of vinegar substitute with lemon juice;the acidity of the lemon mimics that of the vinegar. 

Heavy cream and plain yogurt can be mixed together to substitute crème fraiche. To yield one cup of crème fraiche mix a cup of heavy cream with 1 Tablespoon of plain yogurt.

For baking purposes when you've run out of mayo, sour cream or plain yogurt will do the trick!

When simmering chicken bones on the stove for hours isn't an option, opt for a bouillon cube. Mix the bouillon of your choice (they come in veggie, chicken or beef) with boiling water and presto, instant chicken broth.

So you're brother drank the last bag of milk, what to do? Hurting him isn't a suitable solution so opt for soy, almond or coconut milk. Each milk will offer varying texture and flavour since they all taste quite different, but still yummy!