You can put it in a hose end sprayer, but you'll have to refill it a few times. Use the concentrated Garrett Juice or your own compost tea. A backpack pressure sprayer can do the job also, depending again on how concentrated you make it. I'm thinking of the kind that holds about 1 1/2 gallons. You can get them for a very reasonable price at Tractor Supply (I think when I bought mine it was a package of 2 for $20). And I'm sure they have various sizes of pumps in addition to those. The dilution amount doesn't have to be precise for compost tea.
Here is information from the Organic Library.