plastic bottle
Take an empty plastic bottle/container. One with a 'squirt' cap, so you can easily connect your hose. Then you make many small holes with a needle. When it is full of water, it should barley leak, just 1 or 2 drops - if any. The trick is that just a little pressure gives you very fine jets. Moreover, it is easy to fine tune just by blowing little air in the bottle with your mouth.
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