I don't think that Honda sells special windshield washer fluid, so I'm assuming you mean coolant.

Honda uses a special coolant that is designed to not have any reaction with the aluminum alloy they use in their engines. You can use a different "safe for aluminum" coolant, but it may not have the same 60k miles/5 year life that the Honda Coolant has.

Do not use plain water. Do not use any cheap anti-freeze. Make sure you use a coolant that is designed for use in aluminum or you can ruin the engine.

You don't add water to the radiator in a Honda. Use ONLY premixed honda coolant, available at your local Honda dealer. If its never been done, id recommend draining your old coolant and filling it back up with new Honda fluid.

Just look in your owner's manual. It should say what type of coolant to put it. 98-02 models shouldn't need anything special, they only started doing that around '05ish on. If it's not a special type of coolant, then just use the green type antifreeze. You do not need to buy it pre-mixed. You can figure out the capacity of your engine through the manual, buy straight anti-freeze and pour half the capacity antifreeze into the radiator, followed by then pouring water until full. You'll save a little money that way.

If it does not say to use a special coolant then don't waste money buying the "safe for aluminum" stuff. Normal green antifreeze will work here.

Always use distilled water when mixing your own coolant, tap water can be very hard (high in calcium carbonate) and tends to be corrosive, eating water pump seals and bare aluminum.