Rake back mulch being careful not to disturb surface roots. Do not leave roots exposed for more than a few minutes. Lay down two to three sheets of newspaper, wet it and rake the mulch back over. This can slow water loss but newspaper must be moistened when you put it down. Reduce practices that require the plant to use water.
Fertilization requires water to be active.
Wait until later to fertilize. Pruning also increases water needs. Do not shear shrubs now, although you can carefully select individual branches to be removed. Raise mowing heights on lawns slightly but do not exceed maximum height for the lawngrass you have. Wait until plants wilt to water them.