The problem with orchids is that you can't have just one. You may start with one, but the quantity seems to increase exponentially. Applying fertilizer and other chemicals becomes more time consuming and require a degree in math.
My sister was mixing plant food in a gallon bottle and using it to fill a quart squirt bottle. During a conversation, she commented that it made her hand hurt to sprits her orchids. She needs to graduate to a pump sprayer. For her first I recommended a basic 1-gallon size. The volume is the same, it is mobile, easily stirred while being used, and has an adjustable nozzle. Problem solved. It saved her hands and doesn't need to be refilled as often.
My case is a little different. During the winter I use 2-gallon pump sprayers. I don't feed every time I water and not all orchids get watered. I fill three sprayers and let them sit to stabilize the temperature. It also requires simple calculations. At 1/2 the recommended strength of 1 tsp. plant food per gallon, I use 1 tsp. plant food. If the solution is insecticide or fungicide, I mix at the recommended rate.
My orchids are outside during the summer. Due to higher temperatures they require more water and because they are in active growth more plant food. I have an Ortho hose end sprayer designed for application of liquids. This is a siphon mixer with a dial to control the dilution rate.
The Ortho instructions recommend the setting at 4 ounces per gallon for water-soluble fertilizer. I dissolve 2 TBS (water-soluble) plant food in warm water, add 1/4 tsp. Superthrive, pour it into the reservoir, and then fill with water to the full level. I use a continuous spray until the siphon reservoir is empty. The end result is 8 gallons of plant food mixed at 3/4 tsp. per gallon of water. It takes less than 5 minutes to feed and water nearly 200 square feet of potted, mounted, and hanging orchids.
Some will argue that it isn't as accurate as Dosimeter or Hozon 1:16 siphon. Their optimum capacities currently exceed my requirements. By mixing a little under the recommended strength and spraying continuously until the reservoir is too low for the siphon to work "Gets'er done".
