If for piece of mind you want to know you can get an epi if you need to, i would opt to give birth somewhere else which also has a birthing pool.
I hope to have a water birth but like the reassurance that if it gets too much i can have an epi.
Ultimately, if you change where you're giving birth to cover all pain relief methods, it's one less thing to be worrying about. You'll be just fine without an epi but we can go out of our minds with worry sometimes!!
Speak to your midwife about this, she should be able to give you more info on the places to give birth which are near to you

