Liquid supply apparatus

A liquid supply apparatus comprising:

• a first support member;
• a second support member;
• a balloon having a first end supported by the first support member and a second end supported by the second support member;
• and
• a casing having a constant longitudinal length, wherein;
• the first support member is fixed to one end of the casing;
• the second support member is fixed to another end of the casing;
• the balloon is supposed by the first support member and the second support member in a state where a tensile stress is applied;
• the second support member includes a filling port for filling the liquid into the balloon;
• the balloon is disposed in the casing and is configured so as to be able to hold therein a liquid to be supplied and discharge the held liquid;
• the balloon is configured to have a completely inflated state in which the balloon is completely filled with the liquid without contacting an inner surface of the casing, and in which the filling port is sealed;
• and
• the first end and the second end of the balloon are positioned in the casing in the completely filled state.