Certain jutsu can be performed regardless of there being a presence of water or not. I would say these would be less powerful than jutsu that require a source but as we have seen from certain ninja (Kisame & Mei), they have the ability to create powerful water jutsu without having to rely on pools of water surrounding them. Saying powerful is a broad term as well. Our RP system determines power by the rank of the jutsu & will always note if they can be used with or without a water source. Of course if there is only a puddle of water & you want to perform certain jutsu that create waves that cover a large area, then it would not be about power as you simply would be unable to perform the jutsu.
In which way you apply water jutsu will also take in effect in regards to power. Creating a large mass of water that can cover near enough, an entire field can be seen as a very forceful attack. You can also compress water to create condensed forms that move at great speeds, which on impact are backed with a great deal of force. Hopefully that can shed some light on your question.
Ook now on to the Jutsu... I would like you to fill out the template for each jutsu & any questions you have regarding the jutsu itself do not hesitate to ask.
[B]Situation you would use it in:[/B]
[B]Perform the jutsu:[/B]
(Kirigakure No Jutsu) - Hidding in Mist Jutsu
You begin releasing your water chakra over a large source of water, the chakra combines with the water & has water molecules rise from the source creating a thin mist. You continue passing your chakra creating a thicker mist to obscure your opponent's vision.
You first take in a deep breath, building your water chakra within your lungs. You then exhale releasing a stream of mist that slowly begins spreading over the field concealing anything within.
A very popular jutsu, commonly used against Sharingan users. It comes with its drawbacks as unless you have a byakugan, there is no way for either side to see each other through the mist. It can be used to create tactical situations to your advantage. Remember to use all other senses while in this mist, being as descriptive as possible allows you to gain an advantage over your opponent. Noises are the biggest give away while in this jutsu, try & be creative when attacking in the mist. Maybe use an earth jutsu that covers a large surrounding scale.
(Suiton: Mizu Kuri No Yaiba) - Water Style: Sword of Draining
You begin gathering water chakra around a desired hand. a "blob" of water begins forming & as it does you then focus on shaping the blob into a sword. on completion your grip the hilt of the water blade, treating it as it a normal weapon.
A basic jutsu allowing you to created a bladed weapon through basically nothing >.>. Best to be used in close combat situations, as your opponent is distracted.