For my MIL and her sisters: Going on a cruise and don't want to spend a fortune on drinks? Pour your vodka in an empty Listerine bottle, add 3 drops of blue food colouring and 1 drop of green. Voilà! You now have a of vodka to use for your beverages! LOL!
Filtering Rainwater in a Barrel: For gardening, rainwater is, naturally, best unfiltered. But, for household use, the vintage book says the following instructions yield a cheap and easy way to make a filter just as good as a patent filter costing 10 times as much!