input question: To combine small amounts of liquid, you can

output answer: Mix them in a shot glass

input question: To make a pastry bag,

output answer: use a clean kitchen towel, cut a round hole in the center with scissors, and insert the piping tip through the hole and screw on the end cap.

input question: How can I neatly keep my laundry soap?

output answer:
Use a large container that was used for huge water dispensers, set detergent in that and open and close the dispenser on that.