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I use a quart size ziptop freezer bag to store brown sugar. Push out as much air as you can, zip it closed, and your brown sugar will stay soft for years. Also, similar to the frosting piping trick, I fill the bag with sour cream, snip the corner off, then rinse out the carton and put the bag in the carton, then back in the fridge. That way, if I need a dollop of sour cream for baked potatoes, tacos, ect., just squeeze it right where you want it. They even make a 10 gallon size that I use for my clothes/gear for camping or motorcycle trips.
I essentially just doubled your recipe, and then poured it back into the half-gallon milk jug and put it in the fridge. Now, every morning, I just fill up my coffee cup, and out the door I go. And I don't have to worry about cleaning and refilling the glass bottles.
Just an FYI...the Pi 3 has built in Wi-Fi, so you don't really need an ethernet cable as long as you have a wireless network in your house. Also, for people new at this, they may want to start out using recalbox (there are instructables on this site), it's a bit easier / noob friendly, but it's no where near as advanced and configurable as retropi. Just another option.
My niece used to clean condos for extra money and she picked up a few cleaning tricks. For cleaning soap scum from showers/tubs, she swears by a 50:50 mix of dishwashing liquid and white vinegar (she claims it HAS to be "blue Dawn", but I'm skeptical about that part). She told my mom, who tried it and swears by it, so I made up a small test batch (1/2 cup each), and my wife tried it out and said it worked great. Apparently, you just spray it on and use a damp cloth to spread it around, wait about 30 to 45 minutes and then rinse it off.
Just as an FYI, because most spray bottles, at least in the U.S. are 32 ounces, the above recipe makes too much. If you want to make this to go into a 32 ounce bottle, use these proportions:3 cups water1.5 tablespoons cornstarch6 tablespoons alcohol6 tablespoons vinegar
Another idea for tools that don't have holes (screwdrivers, nutdrivers, pliers, etc.), is to use magnetic bars.
I take a couple of 1 foot pieces, sliced lengthwise halfway through, and wrap them around the top front legs of my ladder. That way when I put my ladder up against the side of the house, it doesn't scratch or damage the siding.
Does the bottom of the cup have to be square? Although I've seen square bottom cups before, they're not that common. Can anyone confirm that it works equally as well with a round bottom cup?