I tried it over many years, and back in my kit days I ended up using the garden hose; I was always going to buy a water grade hose but never did.
First rule for any hose (garden hose, brewery hose etc), pour some water through it at the temperature you plan on using it at and drink it (drink the water not the hose :lol: ) . If it tastes crappy, you get crappy beer. I found a brand new hose the water always tastes like hose. But once its a bit older, I used to use the hose to clean the fermenter etc. When it's time to fill the fermenter for beer always let the hose run for a minute so you are not using any water that has sat in the hose for any period of time.
In summary, let it run until you have fresh water in the hose then taste test it. If it taste good, then it's good. Then if you ever remember, buy a potable water grade hose.
QldKev