Democratic Alliance (DA) leader Helen Zille promised on Wednesday to push the corruption case against African National Congress (ANC) president Jacob Zuma with "everything we've got" but admitted a shortage of funds might stall her at some point.

"I am satisfied that we can raise enough for the judicial review process," Zille said, shortly after she had finished speaking to some 400 supporters in the Alex Laing town hall in Graaff-Reinet.

"It's not fair that Mr Zuma uses taxpayers' money for his defence. He has enough resources to go on forever."

Zille said she had received many offers of support to help her fight the Zuma case.

Earlier she told a crowd of supporters in the town of Kirkwood outside Port Elizabeth: "We will drive the case with everything we have."

"The NPA's withdrawing of the charges against Zuma is not the end of the matter. The DA is going to fight this with everything we have.

"Our first step is to prove in court that the NPA's dropping of the charges was irrational and unlawful."

The principle of equality before the law is at stake, Zille said.

Zille filed an urgent application in the High Court in Pretoria on Tuesday requesting a review of the National Prosecuting Authority's (NPA) decision to drop charges against Zuma. She said the reasons given by the NPA for dropping the charges were irrational.

"The reasons given by Mokotedi Mpshe (the NPA head) for dropping the charges against Mr Zuma were irrational and had nothing to do with the substance of the case," Zille said.

Zille was welcomed to the event with the mainly Afrikaans-speaking delegates singing "Dis Zille wat die wind laat waai" (It's Zille who brings the winds).

Earlier DA member Donald Lee praised Zille for bringing "Winds of Change" to South Africa.

Zille told the audience that Mpshe had buckled to political pressure from the ANC to drop corruption charges against Zuma.

"Mr Mpshe could not be conceived to be taking a neutral decision. He expects Mr Zuma to become President. He knows exactly what happened to his predecessor Vusi Pikoli," she said in reference to the former NPA leader, Vusi Pikoli, who was fired from his job by President Kgalema Motlanthe.

"Mr Mpshe knows that if he does not behave like an ANC cadre he will have no work."

Zille said the DA would go all out to win the national election in 2014.

First the party would try to take a number of municipalities and set an example of good governance.

"In 2014 our plan is to win the national election," she said to a shout of "Zille for President".

In Graaff-Reinet Zille stood on a stage and told the crowd of mainly coloured supporters that they should accept food parcels from the ANC.

"If the ANC come with their food parcels and want you to vote for them, then accept the food parcel, ‘eet baie lekker' (eat nicely) and vote for the DA," she said.

"In 2011 we want to win municipalities across South Africa," she said to cheers and claps.

"In 2014 we want to win the whole land. That is why the ANC is so scared of us."

Before Zille left the stage, she joined the crowd, dancing and singing "Ja, die DA se nuwe droom (yes, the DA's new dream)".

Outside the hall, Zille said she and her advisors would carefully study the areas where they had a chance of winning in the municipal elections in 2011.

"We study the election results with a microscope and we will work out where it is possible for us to win," she said.

She claimed the ANC was lost when it was an opposition party.

"When they are in opposition the ANC are unable to offer tenders and jobs and so they fall apart."

Zille's next stop on her Karoo campaign trip is in the DA-held
town of Willowmore.