Yes i have mine hooked to my faucet. Most ro/di filters i have seen come with an adapter to hook to a faucet. I purchased the one I have from airwaterice.com
Wecome, First I'd like to know what type of tank you are running?
FW or SW? Fish only, reef. What type of fish are you keeping and/or intend to keep?
How old is your tank? the list goes on.
ro/di filter is good but if you just dont have the money then treating your tap water with a de-chlorinator is fine. i use prime because a lot of people recommend it. im fairly new though so dont take my advice over an experienced member.
a few questions i have been meaning to ask. can you overdose with prime to where it is harmful to fish? i do water changes with 5g buckets and i treat each bucket with 1ml of prime and let sit overnight before adding into to tank. i run a filter with carbon which i think helps rid of any chemicals left in the water.
You're best bet, unless you're one of the very few that have acceptable tap water, is to purchase a RO/DI unit. There are numerous reputable vendors online, such as Air, Water and Ice, The Filter Guys, and SpectraPure.